Nucleophile-Induced Ring Enlargement of 1-(1-Iodoalkyl)silacyclobutane and 1-(1,2-Epoxyalkyl)silacyclobutane into Silacyclopentane. Application to the Syntheses of 1,4-Diol, 4-Alken-1-ol, and 1,4,5-Triol
作者:Kozo Matsumoto、Yoshihiro Takeyama、Katsukiyo Miura、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1246/bcsj.68.250
日期:1995.1
Two methods for ring enlargement of silacyclobutane into silacyclopentane have been described. (1) Treatment of 1-(1-iodoalkyl)silacyclobutane with t-BuOK or AgOAc provided 2-alkyl-1-silacyclopentanes which were easily converted into 1,4-diols by oxidative cleavage of carbon–silicon bond. (2) An addition of i-PrOLi to 1-[(Z)-1,2-epoxyhexyl]-1-methylsilacyclobutane gave erythro-2-(1-hydroxypentyl)-1-isopropoxy-1-methylsilacyclopentane, which was converted into (Z)-4-nonen-1-ol, (E)-4-nonen-1-ol, or 1,4,5-nonanetriol.
已描述了两种将硅杂环丁烷扩大为硅杂环戊烷的方法:(1)1-(1-碘烷基)硅杂环丁烷与t-BuOK或AgOAc处理后得到2-烷基-1-硅杂环戊烷,这些产物可通过碳-硅键的氧化裂解容易地转化为1,4-二醇。(2)i-PrOLi加成到1-[(Z)-1,2-环氧己基]-1-甲基硅杂环丁烷中,得到erythro-2-(1-羟基戊基)-1-异丙氧基-1-甲基硅杂环戊烷,后者可转化为(Z)-4-壬烯-1-醇、(E)-4-壬烯-1-醇或1,4,5-壬三醇。