A novel vinyl anion equivalent. An extremely short synthesis of 2-substituted 2-cycloalkenones and prostaglandin key intermediates via destannylselenenylation
作者:Shinya Kusuda、Yoshihiko Watanabe、Yoshio Ueno、Takeshi Toru
DOI:10.1021/jo00037a035
日期:1992.5
The preparation of a novel vinyl anion equivalent and a new destannylselenenylation procedure are described. The conjugate addition of (tributylstannyl)lithium to 2-(phenylseleno)-2-cycloalkenones, followed by the trapping of the resulting enolates with allylic halides, and subsequent destannylselenenylation gives 2-substituted 2-cycloalkenones in high yields, in a one-pot procedure. The destannylselenenylation can be successfully performed under a variety of conditions: treatments with fluoride, bases, Lewis acids, or silica gel as well as thermal or photochemical treatments are effective. Following the described method, chiral prostaglandin E2 key intermediates were obtained in one pot from chiral 4-[(tert-butyldimethylsilyl)oxy]-2-(phenylseleno)-2-cyclopentenone.