Mechanistic Considerations for the Consecutive Cyclization of 2,3-Dibromopropylamine Hydrobromide Giving a Strained Molecule, 1-Azabicyclo[1.1.0]butane
作者:Kazuhiko Hayashi、Yoshifumi Ikee、Satoru Goto、Motoo Shiro、Yoshimitsu Nagao
DOI:10.1248/cpb.52.89
日期:——
The effective formation of 1-azabicyclo[1.1.0]butane (2) by treatment of 2,3-dibromopropylamine hydrobromide (1) with n-BuLi could be understood considering a rational reaction pathway via both transition states 10 and 19 based on the intramolecular Br···Li+ coordination. A similar cyclization pathway starting from N-benzyl-3-bromopropylamine hydrochloride (17) to afford N-benzylazetidine (18) could also be postulated on the basis of a transition state 20 involving the intramolecular Br···Li+ coordination.
考虑到基于过渡态 10 和 19 的合理反应途径,可以理解通过用正丁基锂处理 2,3-二溴丙胺氢溴酸盐 (1) 有效形成 1-氮杂双环[1.1.0]丁烷 (2)分子内Br·Li+配位。基于涉及分子内 Br·Li+ 配位的过渡态 20,也可以假设从 N-苄基-3-溴丙胺盐酸盐 (17) 开始得到 N-苄基氮杂环丁烷 (18) 的类似环化途径。