A novel approach to functionalized polycyclic systems; new aspects of the Diels–Alder reactions of 2-acyl derivative of 4H,6H-thieno[3,4-c]furan 5,5-dioxide
作者:Shojiro Maki、Katsuhiro Konno、Hiroaki Takayama
DOI:10.1039/c39950002025
日期:——
The intramolecular Diels–Alder reaction of the 2-acyl derivative of 4H,6H-thieno[3,4-c]furan 5,5-dioxide 2a is achieved by the use of molecular sieves as additive to give the corresponding cycloadduct 4a in high yield. Addition of efeoophiles to this reaction media afforded the polycyclic compounds 5 and 7a–cvia tandem cycloaddition in a single step.
4 H,6 H-噻吩并[3,4-c]呋喃5,5-二氧化物2a的2-酰基衍生物的分子内Diels-Alder反应是通过使用分子筛作为添加剂来获得相应的环加合物4a高产。在该反应介质中添加嗜碱菌可在一个步骤中通过串联环加成反应得到多环化合物5和7a – c。