ZnCl<sub>2</sub>Promoted Formal (3+2) Cycloaddition Reactions of 2-Alkoxy-1,4-benzoquinones with 2<i>H</i>-Chromenes
作者:Kandasamy Subburaj、Modachur G. Murugesh、Girish K. Trivedi
DOI:10.1080/00397919608005223
日期:1996.8
Abstract A simple, mild, inexpensive and highly efficient method for the synthesis of 2,2-dimethyldihydropyranopterocarpans (4a–h and 5a–b) by formal (3+2) cycloadditionreactions of 2-alkoxy-1,4-benzoquinones (3a–b) with 2H-chromenes (1a–d and 2) using ZnCl2 at room temperature has been developed.