Synthesis of calythrone and related cyclopentene-1,3-diones via rearrangement of 4-ylidenebutenolides
作者:Nicholas G. Clemo、David R. Gedge、Gerald Pattenden
DOI:10.1039/p19810001448
日期:——
Treatment of 4-ylidenebutenolides with sodium methoxide in methanol results in rearrangement to the corresponding cyclopentene-1,3-diones in high yield. The general method is applied in a synthesis of calythrone [(1) from (18)] from Calythrix tetragona, and the relatedcyclopentene-1,3-diones [(15) from (14); (25) from (24); (27) from (26); (33) from (32); and (37) from (36)].