La 亚甲基-6 前列腺素 E 1 est preparee par 烷基化 de la (4D) [(t-丁基二甲基甲硅烷氧基)]-4 phenylseleno-2 cyclopentene-2one par un caprate suvie d'une allylation photochimique avec un allylstannane。Son ozonolyse suivie d'une desilylation et d'une 水解 donne la oxo-6 prostaglandine E 1 naturelle
A novel vinyl anion equivalent. An extremely short synthesis of 2-substituted 2-cycloalkenones and prostaglandin key intermediates via destannylselenenylation
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.
Kusuda, Shinya; Ueno, Yoshio; Toru, Takeshi, Phosphorus, Sulfur and Silicon and the Related Elements, 1994, vol. 97, # 1-4, p. 63 - 70
作者:Kusuda, Shinya、Ueno, Yoshio、Toru, Takeshi
DOI:——
日期:——
TORU, TAKESHI;YAMADA, YOSHIO;UENO, TOSHIO;MAEKAWA, ETURO;UENO, YOSHIO, J. AMER. CHEM. SOC., 110,(1988) N 14, 4815-4817