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 I+/TBHP Catalysis For Tandem Oxidative Cyclization To Indolo[2,3-b]quinolines, published in 2021-01-31, which mentions a compound: 7524-52-9, mainly applied to indoloquinoline preparation chemoselective; indole aniline sulfonamide tandem oxidative cyclization tetrabutylammonium iodide catalyst, Application In Synthesis of H-Trp-OMe.HCl.
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.
Although many compounds look similar to this compound(7524-52-9)Application In Synthesis of H-Trp-OMe.HCl, numerous studies have shown that this compound(SMILES:N[C@@H](CC1=CNC2=CC=CC=C12)C(OC)=O.[H]Cl), has unique advantages. If you want to know more about similar compounds, you can read my other articles.
Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem