Tag: M.W:200-300

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The first tryptophan based turn-off chemosensor for Fe2+ ion detection》. Authors are Nagarajan, Rajendran; Vanjare, Balasaheb D.; Hwan Lee, Ki.The article about the compound:H-Trp-OMe.HClcas:7524-52-9,SMILESS:N[C@@H](CC1=CNC2=CC=CC=C12)C(OC)=O.[H]Cl).Application of 7524-52-9. Through the article, more information about this compound (cas:7524-52-9) is conveyed.

In this research work, we have designed and synthesized a novel Tryptophan-Quinoline conjugated turn-off chemosensor 4 (I) for the selective detection of Fe2+ ion with high sensitivity (3.06 μM) among 21 metal cations such as Ag+, Ca+, Cs+, Cu+, K+, Na+, NH+4, Ba2+, Ca2+, Cd2+, Co2+, Cu2+, Mn2+, Ni2+, Pb2+, Zn2+, Al3+, Au3+, Cr3+ and Fe3+ in DMF-HEPES (1 mM, pH = 7.0, 1:1, volume/volume) aqueous-organic solvent system. It showed a fluorescence quenching mechanism through the blocked PET process. The optical properties, binding mode of the metal ion with the receptor, plausible electron transfer mechanism, and its practical applications have been discussed. This work will open up a new avenue in amino acid-based Fe2+ ion sensors.

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Biosynthesis of penicillins. VI. N-2-Hydroxyethyl amides of some polycyclic and heterocyclic acetic acids as precursors》. Authors are Jones, Reuben G.; Soper, Quentin F.; Behrens, Otto K.; Corse, Joseph W..The article about the compound:2-Bromo-6-(bromomethyl)naphthalenecas:305798-02-1,SMILESS:BrCC1=CC2=CC=C(Br)C=C2C=C1).Category: dioxole. Through the article, more information about this compound (cas:305798-02-1) is conveyed.

2,6-MeC10H6NH2 (78 g.) in 80 mL. concentrated HCl and 200 mL. H2O at 0°, treated at 5° with 35 g. NaNO2 in 50 mL. H2O and, after 0.5 h., with 130 g. ice-cold 42% HBF4, gives 90% of the 2-diazonium fluoroborate, decomposition of which yields 69% 2-methyl-6-fluoronaphthalene (I), m. 77°. I (40 g.) at 210°, treated (15 min.) with 40 g. Br (with illumination with a 100-w. lamp), gives 82% 2-(bromomethyl)-6-fluoronaphthalene (II), b2 125-30°, m. 53°. II (48 g.), added to a refluxing solution of 30 g. KCN in 60 mL. H2O and 200 mL. EtOH, the EtOH removed after refluxing 4 h., 500 mL. H2O added, the solution extracted with ether, and the residue from the ether boiled 5 h. with 40 g. KOH in 40 mL. H2O and 200 mL. EtOH, gives 74% 6-fluoro-2-naphthaleneacetic acid, m. 138-9° (Me ester, b2 163-6°, m. 48-9°). 2,6-MeC10H6NH2 (63 g.) in 100 mL. H2O and 700 g. 48% HBr, treated (3-4 h.) at 5° with 45 g. NaNO2 in 75 mL. H2O and the diazonium solution poured (10 min.) into 170 g. CuBr in 800 mL. 48% HBr at 70-80°, gives 40% 6-bromo-2-methylnaphthalene (III), m. 142° III yields 80% 6-bromo-2-(bromomethyl)naphthalene, m. 124-5° this gives 69% 6-bromo-2-naphthaleneacetic acid, m. 175-6° (Me ester, b2 187-93°, m. 67-9°). 3,2-ClC10H6CHO (32.5 g.), 35 g. hippuric acid, 14.5 g. anhydrous AcONa, and 50 mL. Ac2O, heated on the steam bath 1 h., give 75% 2-phenyl-4-(3-chloro-2-naphthylmethylene)-5(4H)-oxazolone (IV), bright yellow, m. 192° 40 g. IV in 200 mL. 10% NaOH, refluxed 9 h., the mixture diluted to 1500 mL. with H2O, washed with ether, the aqueous solution treated with 20 mL. 12.5 N NaOH and 15 mL. 30% H2O2, allowed to stand overnight, the filtrate acidified with HCl, extracted with ether-C6H6, and the residue esterified, gives 37% Me 3-chloro-2-naphthaleneacetate, b2 163-5°, m. 49-50° the free acid m. 193-4°. 6,2-MeOC10H6Ac (100 g.), 25.5 g. S, and 87 g. morpholine, heated 18 h. at 140°, part of the morpholine removed in vacuo, 250 mL. AcOH and 350 mL. concentrated HCl added, and the mixture refluxed 24 h., give 67% 6-methoxy-2-naphthaleneacetic acid, m. 203-5° (Me ester, b1 192-3°, m. 86°, 73%). 5,6,7,8-Tetrahydro-2-acetonaphthone (50 g.), 13 g. S, and 40 mL. morpholine, refluxed overnight, 400 mL. concentrated HCl and 300 mL. H2O added, and the mixture again refluxed overnight, followed by esterification with EtOH and H2SO4, give Et 5,6,7,8-tetrahydro-2-naphthaleneacetate, b0.5 140-3°. 2-Acetylphenanthrene (13.2 g.), 3.2 g. S, and 10.5 g. morpholine, heated 15 h. at 160°, the mixture treated with 150 mL. AcOH and 36% HCl, and refluxed 24 h., give 81% 2-phenanthreneacetic acid, m. 187-8° the 3-isomer m. 174-5°, 84% (Me ester, b1.5 203-5°, 89%). 8-(Bromomethyl)quinoline (120 g.) in 250 mL. warm EtOH, added (0.5 h.) to 50 g. KCN in 100 mL. warm H2O and the mixture refluxed 1.5 h., gives 78% 8-(cyanomethyl)quinoline, m. 86-7°; hydrolysis with aqueous alc. KOH and esterification give 91% Et 8-quinolineacetate, b3 158-60°. Et 3-quinolinecarboxylate (70 g.), 62 g. AcOEt, and EtONa (12 g. Na and 0.52 mol absolute EtOH) in 100 cc. dry C6H6, refluxed 20 h., the cooled solution poured onto ice, diluted to 5 l. with H2O, treated with 50 mL. 12 N NaOH, washed with two 300 mL. portions of ether, and the aqueous solution neutralized with dilute H2SO4 and extracted with two 500-mL. portions of ether, give 75% Et 3-quinolylformylacetate, m. 84° 27 g. of the keto ester in 125 g. 25% H2SO4, heated 30 min. at 100°, gives 95% 3-acetylquinoline (V). V (7 g.), 5 g. S, 50 mL. (NH4)2S, and 25 mL. H2O, heated 20 h. at 145-50°, the residue extracted with two 300-mL. portions boiling 5% HCl, the solution refluxed 3 h., and the crude acid esterified, give 19% Et 3-quinolineacetate, b2.5 140-2°. pH2NC6H4CH2CO2H (46 g.), 10.5 g. FeSO4, 115 g. C3H5(OH)3, 23 g. PhNO2, and 53 mL. concentrated H2SO4, boiled 5 h., give 37 g. crude acid which, esterified with EtOH and HCl, gives 39% Et 6-quinolineacetate, b3 160° the free acid (VI) m. 218-20°. Et 6-quinolinecarboxylate and AcOEt, condensed with EtONa, give 87% Et 6-quinolineacetate, hydrolysis of which with 25% H2SO4 at 100° gives 90% 6-acetylquinoline, m. 76° the Willgerodt reaction gives 87.5% VI. 3,4 O2N(H2N)C6H3CO2H (108 g.) in 350 mL. concentrated HCl, treated with 125 g. Sn in portions (temperature below 90°), gives 87% (3,4-diaminophenyl)acetic acid-2HCl (VII), m. 222-4° (decomposition); Et ester-2HCl (VIII), m. 185-7° (decomposition); 3 g. VII and 20 mL. 98-100% HCO2H, heated several hrs., give 100% 5-benzimidazoleacetic acid-HCl, m. 240-2° the Et ester m. 65-6°, 75%. VIII (14 g.) in 200 mL. ice H2O, treated with excess COCl2, gives 95% Et 2-hydroxy-5-benzimidazoleacetate, m. 208-9°. NCCH2CO2Et (113 g.) and 15 g. (HOCH2CH2)3N in 100 mL. absolute EtOH, treated with a slow stream of H2S, the mixture poured after 5 days into ice-H2O, and 38 g. of the resulting oil and 23.1 g. ClCH2Ac in 300 cc. anhydrous ether kept 4 days, give 20.6 g. Et 4-methyl-2-thiazoleacetate, b17 136-9°. Thiaxanthydrol (42 g.), 30 g. CH2(CO2H)2, and 80 mL. C5H5N, heated 2 h. at 60-70° and 2 h. at 90-5° and the liquid poured into 600 mL. 2 N HCl, give 90% 9-thiaxantheneacetic acid, m. 167-8° (Me ester, b2 182-4°). The Ag salt of 2-benzylimidazole (53 g.) and 50 g. BrCH2CO2Et in 200 mL. xylene, refluxed 48 h., give 25.4% of the Et ester, m. 70-70.5°, of 2-benzyl-1-imidazoleacetic acid, m. 173-4°. Me 1-acenaphtheneacetate, b4 176-8°. N-2-Thienylacetyl-DL-valine m. 110-12°. Amides were prepared by heating the Me or Et ester of the various acids with a slight excess of HOCH2CH2NH2 at 100-150° for several hrs.; R in RCH2CONHCH2CH2OH is given, together with S (see part V). 2-C10H7 m. 125-7°, S 1.3; 1-bromo-2-naphthalene m. 155-6°, S 0.5; 6-fluoro-2-naphthalene m. 145-6°, S 1.2; 3-chloro-2-naphthalene m. 150-1°, S 0.3; 6-bromo-2-naphthalene m. 167-8°, S 0.9; 5,6,7,8-tetrahydro-2-naphthalene m. 88-90°, S 0.9; 1-nitro-2-naphthalene m. 154-5°, S 0.9; 6-methoxy-2-naphthalene m. 160°, S 1.1; 1-acenaphthene m. 160°, S 1.1; 9-fluorene m. 127-8°, S 0.7; 2-phenanthrene m. 135-7°, S 0.5; 3-isomer m. 133-5°, S 0.5; 1-pyrrole m. 85-7°, S 0.9; 2-thiophene m. 66-7°, S 1.8; 2-furan oil, S 0.4; 2,6-dihydroxy-5-pyrimidine m. 271-2°, S 1; 2-methyl-4-hydroxy-5-pyrimidine m. 184°, S 0.9; 3,4-methylenedioxyphenyl m. 99-100°, S 1; 2-methyl-4-thiazole m. 93-4°, S 0.85; 4-methyl-2-thiazole m. 80-2°, S 0.9; 2-pyridine m. 93-4°, S 1; 3-isomer m. 94° S 1; 6-methyl-2-pyridine m. 49-50°, S 1; 2-benzyl-1-imidazole m. 177-9°, S 1; 3-quinoline m. 151-2°, S 1; 6-isomer m. 135°, S 1; 8-isomer m. 92-3°, S 1; 2-benzimidazole m. 185-90°, S 1; 5-isomer m. 160-2°, S 1; 2-hydroxy-5-benzimidazole m. 245-6°, S 1; 7-hydroxy-4-coumarin m. 114-16°, S 1; 9-xanthene m. 157-8°, S 0.8; 9-thiaxanthene m. 148-9°, S 0.7; 5-hydantoin m. 160-2°, S 0.9. Only a few of these compounds appeared to be utilized readily by the mold for the formation of new penicillins. Several of the compounds appeared to effect some increase in penicillin yield or to change the differential assay value of the crude penicillin produced in their presence.

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

SDS of cas: 305798-02-1. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2-Bromo-6-(bromomethyl)naphthalene, is researched, Molecular C11H8Br2, CAS is 305798-02-1, about Regioselective control by a catalyst switch in palladium-catalyzed benzylallylation of arylethylidene malononitriles. Author is Zhang, Xuan; Yu, Xiaoqiang; Feng, Xiujuan; Liu, Hesong; He, Ren; Yamamoto, Yoshinori; Bao, Ming.

Regioselective control by a catalyst switch in palladium-catalyzed benzylallylation of arylethylidene malononitriles (α-benzyl-β-allylation vs. α-allyl-β-benzylation) is described. The three-component reaction of 2-(bromomethyl)naphthalenes, arylethylidene malononitriles, and allyltributylstannane proceeds smoothly with palladium nanoparticles as a catalyst to provide α-benzyl-β-allylation products in good yields. The regioselectivity of the benzylallylation reaction is completely overturned with Pd(PPh3)4 as the catalyst instead of palladium nanoparticles to obtain α-allyl-β-benzylation products in moderate to good yields.

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1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: H-Trp-OMe.HCl, is researched, Molecular C12H15ClN2O2, CAS is 7524-52-9, about Organometallic AlaM reagents for umpolung peptide diversification.SDS of cas: 7524-52-9.

Selective modification of peptides and proteins is emerging as a promising strategy to develop novel mechanistic probes and prepare compounds with translational potential. While many methods to perform direct bioconjugation rely on reactions with dehydroalanine, an alternative strategy capitalizing on polarity reversal at the β carbon in amino acids can open access to a new type of diversification reactions characterized by absolute control of regio- and stereoselectivity. Here, we report that alanine carbastannatranes AlaSn can serve as a universal synthon in various C-C and C-heteroatom bond-forming reactions demonstrated in over 50 diverse examples. These reagents are compatible with peptide and protein manipulation techniques and undergo chemoselective conjugation in minutes when promoted by Pd(0). Despite their increased nucleophilicity and propensity to transfer the alkyl group, AlaSn operate at room temperature under buffered conditions (pH 6.5-8.5). We also show that AlaSn can be easily transformed into several canonical L- and D-amino acids in arylation, acylation, and etherification reactions. Furthermore, AlaSn can partake in macrocyclizations exemplified by the synthesis of medium size cyclic peptides with various topologies (7-13 membered macrocycles). Taken together, metalated alanine AlaSn demonstrate unparalleled scope and represent a new type of umpolung reagents suitable for structure-activity relationship studies and peptide diversification.

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Alaimo, Robert J. researched the compound: 6,7-Dichlorobenzo[d]thiazol-2-amine( cas:25150-27-0 ).Recommanded Product: 6,7-Dichlorobenzo[d]thiazol-2-amine.They published the article 《Preparation and characterization of 2-amino-5,6-dichloro- and 2-amino-6,7-dichlorobenzothiazole》 about this compound( cas:25150-27-0 ) in Journal of Heterocyclic Chemistry. Keywords: benzothiazoles amino via anilines; amino chloro benzothiazoles separation; anilines thiocyanation benzothiazoles. We’ll tell you more about this compound (cas:25150-27-0).

A mixture of 2-amino-5,6-dichlorobenzothiazole (I) and 2-amino-6,7-dichlorobenzothiazole (II) is prepared by the reaction of 3,4-dichloroaniline (III) with thiocyanogen. 2-Amino-4,5-dichlorophenyl thiocyanate and 6-amino-2,3-dichlorophenyl thiocyanate are the intermediates of I and II. Thus, III is treated with KSCN, thiocyanogen is formed by the addition of Br, and the I-II mixture obtained is separated via HCl salt formation. NMR spectra are given.

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

Zeng, Huiying; Wang, Zemin; Li, Chao-Jun published an article about the compound: H-Trp-OMe.HCl( cas:7524-52-9,SMILESS:N[C@@H](CC1=CNC2=CC=CC=C12)C(OC)=O.[H]Cl ).Recommanded Product: 7524-52-9. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:7524-52-9) through the article.

Transition metal catalyzed C-H functionalizations was developed as powerful methods for C-C bond formations. Directing groups, removable directing groups, traceless directing groups, and transient directing groups (TDGs) were successfully used to improve the reaction efficiencies. For the development of greener and more sustainable methods, C-H functionalization using a TDG that also serves as a reagent in aqueous solvent was investigated. The palladium-catalyzed C-H functionalization of tryptamine derivatives using ketones in water successfully generated tetrahydro-β-carbolines with a quaternary carbon center at C1. Deuterium-labeling experiments were discussed to provide insight into the mechanism. The C2-position of pyridine was also successfully functionalized by this strategy.

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: H-Trp-OMe.HCl( cas:7524-52-9 ) is researched.Reference of H-Trp-OMe.HCl.Michigami, Kenichi; Sakaguchi, Tatsuhiko; Takemoto, Yoshiji published the article 《Catalytic dehydrative peptide synthesis with gem-diboronic acids》 about this compound( cas:7524-52-9 ) in ACS Catalysis. Keywords: peptide synthesis coupling steric effect; amidation dehydrative gem diboronic acid catalyst reaction mechanism; diboronic acid catalyst crystal mol structure DFT. Let’s learn more about this compound (cas:7524-52-9).

Alkane-gem-diboronic acids have emerged as versatile organoboron catalysts for dehydrative amidation of α-amino acids. A phenol-substituted multiboron catalyst with a B-C-B structure outperformed simple arylboronic acids in the condensation of α-amino acids with suppressed epimerization of electrophiles. gem-diboronic acid catalysis were compatible with various O, N, and S-functionalized α-amino acids bearing N-protecting groups including common carbamates used in peptide synthesis (Boc, Cbz, Fmoc). Gem-Diboronic acid catalysis were compatible with various O, N, and S-functionalized α-amino acids bearing N-protecting groups including common carbamates used in peptide synthesis (Boc, Cbz, Fmoc). N-trifluoroacetyl protection enabled an unprecedented catalytic dehydrative peptide synthesis at room temperature Preliminary mechanistic studies revealed carboxylate-binding nature of gem-diboronic acids, orthogonal to the activation of carboxylic acids by arylboronic acids. The distinctive reactivity of the gem-diboronic acids would open prospects for mild catalytic peptide condensation.

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Hetarylazo disperse dyes derived from 5,6-dichloro- and 6,7-dichloro-2-aminobenzothiazoles, published in 1992, which mentions a compound: 25150-27-0, mainly applied to aminodichlorobenzothiazole azo dye isomer; benzothiazole azo disperse dye polyester, SDS of cas: 25150-27-0.

The isomer mixtures resulting from the diazotization of 5,6-(6,7-)dichloro-2-aminobenzothiazole and coupling to N-substituted anilines were separable by column chromatog. Isomer characterization was effected by unambiguous dye synthesis from the individual dichloro-2-aminobenzothiazoles, and by 1H NMR. The color and dyeing parameters of the isomers on polyester were essentially equivalent, and similar to those of the corresponding isomer mixtures

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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: H-Trp-OMe.HCl(SMILESS: N[C@@H](CC1=CNC2=CC=CC=C12)C(OC)=O.[H]Cl,cas:7524-52-9) is researched.Name: 5-(11bR)-Dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl-5H-dibenz[b,f]azepine. The article 《A fast and direct iodide-catalyzed oxidative 2-selenylation of tryptophan》 in relation to this compound, is published in Chemical Communications (Cambridge, United Kingdom). Let’s take a look at the latest research on this compound (cas:7524-52-9).

A metal-free 2-selenylation of tryptophan derivatives is reported, where the use of iodide as the catalyst and oxone as the oxidant is key to obtain high yields. Various functional groups within the di-selenyl and the indole ring are tolerated, and no racemization is generally observed

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1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem

Uyanik, Muhammet; Tanaka, Hiroki; Ishihara, Kazuaki published the article 《I+/TBHP Catalysis For Tandem Oxidative Cyclization To Indolo[2,3-b]quinolines》. Keywords: indoloquinoline preparation chemoselective; indole aniline sulfonamide tandem oxidative cyclization tetrabutylammonium iodide catalyst.They researched the compound: H-Trp-OMe.HCl( cas:7524-52-9 ).HPLC of Formula: 7524-52-9. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:7524-52-9) here.

A chemoselective tandem oxidative cyclization/aromatization of indole derivatives tethered to aniline sulfonamides using catalytic amount of tetrabutylammonium in the presence of tert-Bu hydroperoxide (TBHP) as an oxidant under nearly neutral conditions at room temperature is reported. The corresponding indolo[2,3-b]quinolines were obtained as sulfonate salts, which could be easily isolated in anal. pure form via only a simple filtration of the crude reaction mixture The natural product quinindoline could be easily obtained after basic work-up of the sulfonate salt. Control experiments revealed that both ionic and radical active species could be generated in situ under mild conditions for the corresponding oxidative transformations to proceed in a chemoselective manner.

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1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem