Synthesis of the atropurpuran A-ring via an organocatalytic asymmetric intramolecular Michael addition
作者:Huan Chen、Dan Zhang、Fei Xue、Yong Qin
DOI:10.1016/j.tet.2013.02.078
日期:2013.4
The asymmetric synthesis of the A-ring fragment 2a–b of atropurpuran 1 has been achieved in 15 steps with up to 70% ee via an organocatalytic intramolecular Michael addition of nitroalkene 10. The absolute configuration of the two contiguous carbon centers in 2a and 2b was assigned to be (4S, 5R) and (4R, 5R), respectively, using the modified Mosher's method.
阿托普嘌呤1的A环片段2a – b的不对称合成已通过15个步骤完成,其中硝基苯10的有机催化分子内迈克尔加成使ee高达70%。使用改进的Mosher方法将2a和2b中两个连续碳中心的绝对构型分别指定为(4 S,5 R)和(4 R,5 R)。