Dialkylation of 2,3-butanedione diketal with 1,8-bis(trimethylsilyl)-2,6-octadiene (BISTRO). Application to the synthesis of estrone derivatives
作者:Hélène Pellissier、Maurice Santelli
DOI:10.1016/0040-4020(96)00460-7
日期:1996.7
Titanium tetrachloride mediated-dialkylation of 2,3-butanedione ketal 2 by 1,8-bis(trimethylsilyl)-2,6-octadiene (BISTRO) 1 led to 1-acetyl-1-methyl-2,5-divinylcyclopentane 4. This latter was methoxycarbonylated (NaH/dimethylcarbonate) and then alkylated with iodobenzocyclobutene (Cs2CO3/acetone) to give a benzocyclobutenic intermediate 6, whose thermolysis provided the 12-oxo-estrane derivatives 8–11
四氯化钛介导的1,3-双(三甲基甲硅烷基)-2,6-辛二烯(BISTRO)1的2,3-丁二酮缩酮2的二烷基化反应生成1-乙酰基-1-甲基-2,5-二乙烯基环戊烷4。后者被甲氧基羰基化(NaH /碳酸二甲酯),然后用碘代苯并环丁烯(Cs 2 CO 3 /丙酮)烷基化,得到苯并环丁烯中间体6,其中间体热解提供了12-氧-雌烯衍生物8-11。