Regioselective Synthesis of Indolopyrazines through a Sequential Rhodium-Catalyzed Formal [3+3] Cycloaddition and Aromatization Reaction of Diazoindolinimines with Azirines
作者:Yonghyeon Baek、Chanyoung Maeng、Hyunseok Kim、Phil Ho Lee
DOI:10.1021/acs.joc.8b00115
日期:2018.2.16
A regioselective synthetic method for the preparation of indolopyrazines was demonstrated through a sequential Rh-catalyzed formal [3+3] cycloaddition and aromatization reaction of a wide range of diazoindolinimines with azirines. Because the previously reported synthetic methods afforded mixtures of indolopyrazines, the present method using unsymmetrical azirines has a strong advantage from a regioselectivity
ZnCl<sub>2</sub>-Catalyzed [3 + 2] Cycloaddition of Benzimidates and 2<i>H</i>-Azirines for the Synthesis of Imidazoles
作者:Shoujie Shi、Kang Xu、Cheng Jiang、Zhenhua Ding
DOI:10.1021/acs.joc.8b02437
日期:2018.12.7
ZnCl2-catalyzed [3 + 2] cycloaddition reaction of benzimidates and 2H-azirines has been developed. This convenient method allowed the efficient construction of a series of multisubstituted imidazoles in moderate to good yields under mild reaction conditions. This transformation exhibits good reactivity and high functional group tolerance.