Inter- as well as intramolecular competition experiments have been performed to demonstrate that N,N-dialkylcarboxamides react faster than tert-butyl esters with the titanium intermediates formed from ethylmagnesium bromide and methyltitanium triisopropoxide to selectively yield cyclopropylamines rather than cyclopropanols. Thus, functionalized organozinc reagents including a series with tert-butyl ester functionalities could be employed under newly developed conditions to transform N,N-dialkylformamides into chloroalkyl-substituted N,N-dialkylcyclopropylamines (55-67%) and tert-butyl (N,N-dialkylaminocyclopropyl)alkanoates (24-63% yield).
已进行分子间和分子内竞争实验,证明N,N-二烷基羧酰胺比叔丁酯更快与
乙烯基溴化镁和甲基三异丙氧基
钛形成的
钛中间体反应,从而选择性地生成
环丙胺而非
环丙醇。因此,在新开发的条件下,包括具有叔丁酯功能团的系列在内的功能化
有机锌试剂可以用于将N,N-二烷基甲酰胺转化为
氯代烷基取代的N,N-二烷基
环丙胺(产率55-67%)和叔丁基(N,N-二烷基
氨基环丙基)烷酸酯(产率24-63%)。