Enantioselective synthesis of bicylco[3.2.1]octan-8-ones using a tandem Michael–Henry reaction
作者:Derong Ding、Cong-Gui Zhao、Qunsheng Guo、Hadi Arman
DOI:10.1016/j.tet.2010.04.044
日期:2010.6
have been prepared from a tandem Michael–Henry reaction between cyclohexane-1,2-diones and nitroalkenes using a quinine-derived thiourea as the catalyst. Although four stereogenic centers were created during the reaction, only two diastereomers were obtained in good diastereoselectivity and high enantioselectivity (92–99% ee). When 3-methylcyclohexane-1,2-dione (R1=Me) was used as the substrate, only
双环[3.2.1]辛烷-8-酮是由环己烷-1,2-二酮和硝基烯烃之间的串联迈克尔-亨利反应制备的,使用奎宁衍生的硫脲作为催化剂。尽管在反应过程中产生了四个立体中心,但仅获得了两种非对映异构体,具有良好的非对映选择性和高对映选择性(92-99% ee)。当3-甲基环己烷-1,2-二酮(R 1 =Me)用作底物时,仅获得相应热力学烯醇化物的区域异构产物。