COA of Formula: C34H22NO2P. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 5-(11bR)-Dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl-5H-dibenz[b,f]azepine, is researched, Molecular C34H22NO2P, CAS is 1265884-98-7, about Enantio- and Diastereoselective Spiroketalization Catalyzed by Chiral Iridium Complex. Author is Hamilton, James Y.; Rossler, Simon L.; Carreira, Erick M..
In the presence of [Ir(cod)Cl]2 and a nonracemic dibenzazepinyl dinaphthodioxaphosphepine ligand, hydroxy ketone-containing allylic carbonates such as I (Boc = t-BuO2C) underwent distereoselective and enantioselective spiroketalization reactions to yield spiroketals such as II in 62-99% yields, 1.2:1->25:1 dr (the diastereoselectivity of the 1.2:1 dr reaction was improved to >25:1 dr on equilibration with acid), and in 94:6->99:1 er. The protocol was effective for the preparation of a collection of spiroketals of various ring sizes and substituents, including heteroatoms, with high enantio- and diastereoselectivity. Furthermore, the enantio- and diastereoselective spiroketalization was used in tandem with an acetalization reaction and a second spiroketalization reaction to exert concomitant stereocontrol over addnl. stereogenic centers. The structure of a nonracemic spiropyranpyrrolopyran was determined by X-ray crystallog.
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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem