Preparation of a Cycloheptane Ring from a 1,2-Diketone with High Stereoselectivity
作者:Yoshiaki Takada、Kenichi Nomura、Seijiro Matsubara
DOI:10.1021/ol102237b
日期:2010.11.19
Treatment of 1,6-dialkylhexa-1,5-diene-3,4-diones with bis(iodozincio)methane gave zinc alkoxides of cis-5,6-dialkylcyclohepta-3,7-diene-1,3-diol in good yields at room temperature. The reaction proceeded with high stereospecificity. Bis(iodozincio)methane converted the diketone into the cis-divinylcyclopropane-1,2-diol stereoselectively; this diol transformed into the corresponding cycloheptane derivative
用双(碘并甲烷)甲烷处理1,6-二烷基六-1,5-二烯-3,4-二酮可得到顺式-5,6-二烷基环庚-3,7-二烯-1,3-二醇的锌醇盐在室温下收率。反应以高立体特异性进行。双(碘嗪)甲烷将二酮立体选择性地转化为顺式-二乙烯基环丙烷-1,2-二醇。该二醇经Cope重排立体定向转化为相应的环庚烷衍生物。