Lithiation of 1-alkynyl-1-chlorocyclopropanes and subsequent reactions with electrophilic reagents: synthesis of functionalized alkynyl- and vinylidenecyclopropanes
作者:V. D. Gvozdev、K. N. Shavrin、O. M. Nefedov
DOI:10.1007/s11172-019-2566-4
日期:2019.7
organolithium species react with carbon dioxide (dry ice) and acetone to give selectively hitherto unknown 1-alkynylcyclopropanecarboxylic acids and the corresponding alcohols in up to 74% yields. Similar reactions involving methyl chloroformate result in the mixtures of cyclopropylacetylenic and vinylidenecyclopropanic esters, while the use of aliphatic aldehydes as electrophiles provides secondary allenic
1-炔基-1-氯环丙烷在-40—0°C 的THF 中用BunLi 处理后发生氯-锂交换。由此产生的有机锂物质与二氧化碳(干冰)和丙酮反应,以高达 74% 的产率选择性地产生迄今为止未知的 1-炔基环丙烷羧酸和相应的醇。涉及氯甲酸甲酯的类似反应产生环丙基乙炔酯和亚乙烯基环丙酸酯的混合物,而使用脂肪醛作为亲电子试剂提供仲丙醇,产率高达 64%。