Stereoselective synthesis of cyclopropanone ketals via silyl chloride promoted cyclization of β-zinciopropionates
作者:Keigo Yasui、Shuji Tanaka、Yoshinao Tamaru
DOI:10.1016/0040-4020(95)00331-2
日期:1995.6
Alkyl, allyl, and propargyl β-iodopropionates undergo a cyclopropanation by the reaction with zinc-copper couple and TBDMSCl in THF to give 1-alkoxy-, 1-allyloxy-, and 1-propargyloxy-1-tert-butyldimethylsiloxycyclopropanes in moderate or good yields. β-Iodo-α-methylpropionates 2 and 6 provide trans-5 and trans-8 selectively, while β-iodobutyrates 3 and 7 furnish cis-5 and cis-8 selectively.
烷基,烯丙基和炔丙基β-碘丙酸酯通过与锌-铜对和TBDMSCl在THF中反应而进行环丙烷化,生成中度或良好的1-烷氧基-,1-烯丙氧基-和1-炔丙基氧基-1-叔丁基二甲基甲硅烷氧基环丙烷产量。β碘α-methylpropionates 2和6提供反式- 5和反式- 8选择性,而β-iodobutyrates 3个7配料顺- 5和顺- 8选择性。