公开了前所未有的硒催化炔烃的炔丙基氧化。各种炔丙基膦酸酯和3-链烷酸酯通过不寻常的CC三键迁移和乙烯基碳上的硒烯基化反应,有效地转化为有价值的炔酮。通过烯胺中间体的互变异构和S N 2置换的策略,相似的条件对于乙酰胺的氧化双官能化有效,从而提供了具有高区域选择性的多取代恶唑。机理研究揭示了这些详细的过程。
Concise Assembly of Highly Substituted Furan-Fused 1,4-Thiazepines and Their Diels−Alder Reactions with Benzynes
作者:Hanfeng Ding、Yiping Zhang、Ming Bian、Weijun Yao、Cheng Ma
DOI:10.1021/jo702299m
日期:2008.1.1
A facile and highly efficient three-component reaction of thiazole or benzothiazole carbenes, disubstituted ketenes, and activated alkynes is disclosed. With this methodology, a polysubstituted ring system containing furo[2,3-c]thiazepine core can be constructed from simple and readily accessible starting materials in good yields. The scope and limitation of this transformation were investigated in detail by using various thiazole carbene, ketene, and alkyne components. Furthermore, the synthetic utilities of these unique polyheterocyclic compounds were demonstrated via their Diels-Alder reactions with benzynes to furnish thiazepine-fused 7-oxanorbornadiene derivatives in excellent yields.
A Ring-Expansion Methodology Involving Multicomponent Reactions: Highly Efficient Access to Polysubstituted Furan-Fused 1,4-Thiazepine Derivatives