Carbon–Carbon Bond Formation by the Use of Chloroiodomethane as a C<sub>1</sub>Unit. II. The Preparation and Synthetic Application of 1-Chloro-3-iodoheptane
作者:Sotaro Miyano、Hiroshi Hokari、Yoshiharu Umeda、Harukichi Hashimoto
DOI:10.1246/bcsj.53.770
日期:1980.3
Terminal alkenes, R–CH=CH2 (R=Et, n-Pr, n-Bu, n-Hex), were readily transformed into 1-chloro-3-iodoalkanes by the AIBN-induced free radical addition of chloroiodomethane. Thus, 1-chloro-3-iodoheptane was obtained from 1-hexene in an 88% yield; this in turn was allowed to react with dialkyl malonates in the presence of alkoxides in alcohols to give dialkyl 2-butylcyclobutane-1,1-dicarboxylates and dialkyl
通过 AIBN 诱导的氯碘甲烷自由基加成,末端烯烃 R–CH=CH2(R=Et、n-Pr、n-Bu、n-Hex)很容易转化为 1-chloro-3-iodoalkanes。因此,1-氯-3-碘庚烷以88%的产率从1-己烯得到;在醇中的醇盐存在下,这又使其与丙二酸二烷基酯反应,得到 2-丁基环丁烷-1,1-二羧酸二烷基酯和 (E)-3-辛烯-1,1-二羧酸二烷基酯 (7),可以通过选择实验参数优先获得。烯烃产物7进一步用于合成(E)-5-癸烯乙酸酯和/或1,4-壬内酯。