An Efficient CuCN-Catalyzed Synthesis of Optically Active 2,3-Allenols from Optically Active 1-Substituted 4-Chloro-2-butyn-1-ols
作者:Jing Li、Wangqing Kong、Chunling Fu、Shengming Ma
DOI:10.1021/jo900710e
日期:2009.7.17
The sequential treatment of optically active terminal propargylic alcohols with n-BuLi/(HCHO)n and regioselective chlorination afforded the corresponding optically active 4-chloro-2-butyn-1-ols. With R1 being a methyl or an ethyl group, an alternative for the synthesis of the corresponding optically active propargylic alcohols is the Novozym 435-catalyzed kinetic resolution of these racemic 4-chloro-2-butyn-1-ols
用n- BuLi /(HCHO)n连续处理旋光性末端炔丙醇并进行区域选择性氯化,得到相应的旋光性4-氯-2-丁炔-1-醇。当R 1为甲基或乙基时,合成相应的旋光炔丙醇的另一种方法是由Novozym 435催化的这些外消旋4-氯-2-丁炔-1-醇的动力学拆分。这些旋光的4-氯-2-丁炔-1-醇与相应的格氏试剂的随后反应在5 mol%的CuCN的催化下以良好的收率提供了旋光的仲2,3-烯醇,收率高达> 99 %ee。