Synthesis of Diastereomeric 3,6-Diaminobicyclo[3.1.0]hexane Derivatives: A Stereocomplementary Approach
作者:Elmar Vilsmaier、Joachim Fath、Gerhard Maas
DOI:10.1055/s-1991-28406
日期:——
Diastereomeric (1α,3β,5α,6β)- and (1α,3α,5α,6β)-diaminobicyclo [3.1.0]hexane-6-carbonitriles 12 and 16 were synthesized with high stereoselectivity from 1,4-cyclohexanedione monoacetal 6 via chloroenamines 17 and 18, respectively. The sequence of reaction of 6 with a cyclic amine to give an enamine, chlorination with N-chlorosuccinimide and subsequent cyclopropanation with cyanide ion in the presence of a phase-transfer catalyst, cleavage of the acetal function followed by reductive amination, leads to 12. Changing the order of these synthetic steps allows an easy approach to 16. The configurations of 12 and 16 were established by 1H- and 13C-NMR data and an X-ray structural analysis of 16b.
通过氯烯胺 17 和 18,分别以 1,4-环己二酮单乙醛 6 为原料,以高立体选择性合成了非对映的 (1δ±,3δ²,5δ±,6δ²)- 和 (1δ±,3δ±,5δ±,6δ²)- 二氨基双环 [3.1.0]己烷-6-甲腈 12 和 16。6 与环胺反应生成烯胺,与 N-氯代丁二酰亚胺发生氯化反应,随后在相转移催化剂存在下与氰离子发生环丙烷化反应,裂解缩醛功能,然后进行还原胺化反应,最终得到 12。改变这些合成步骤的顺序,就可以很容易地得到 16。通过 1H 和 13C-NMR 数据以及 16b 的 X 射线结构分析,确定了 12 和 16 的构型。