1-Substituted β-Carbolines by a Pictet−Spengler Cyclization with Thioortho Esters and Carbon−Carbon Bond Formation via N-Sulfonyl Iminium Ions Generated from N,S-Sulfonyl Acetals
摘要:
[GRAPHICS]The reaction of N-tosyltryptamines with thioortho esters, leading to 1-thiosubstituted tetrahydro-beta-carbolines under modified Pictet-Spengler conditions, is described. The 1-heterosubstituted beta-carbolines furnished 1-substituted beta-carbolines upon reaction with Grignard reagents and silyl derivatives under Lewis acid promotion.
1-Substituted β-Carbolines by a Pictet−Spengler Cyclization with Thioortho Esters and Carbon−Carbon Bond Formation via N-Sulfonyl Iminium Ions Generated from N,S-Sulfonyl Acetals
摘要:
[GRAPHICS]The reaction of N-tosyltryptamines with thioortho esters, leading to 1-thiosubstituted tetrahydro-beta-carbolines under modified Pictet-Spengler conditions, is described. The 1-heterosubstituted beta-carbolines furnished 1-substituted beta-carbolines upon reaction with Grignard reagents and silyl derivatives under Lewis acid promotion.
1-Substituted β-Carbolines by a Pictet−Spengler Cyclization with Thioortho Esters and Carbon−Carbon Bond Formation via <i>N</i>-Sulfonyl Iminium Ions Generated from <i>N,S</i>-Sulfonyl Acetals
作者:Claudio C. Silveira、Luciana A. Felix、Antonio L. Braga、Teodoro S. Kaufman
DOI:10.1021/ol051342i
日期:2005.8.1
[GRAPHICS]The reaction of N-tosyltryptamines with thioortho esters, leading to 1-thiosubstituted tetrahydro-beta-carbolines under modified Pictet-Spengler conditions, is described. The 1-heterosubstituted beta-carbolines furnished 1-substituted beta-carbolines upon reaction with Grignard reagents and silyl derivatives under Lewis acid promotion.