and multisubstituted alkenes was developed to furnish optically active cyclobutanes in high yields with >99/1 dr and up to >99% ee. By application of the newly developed method, the total synthesis of (+)-piperarborenine B was completed in eight steps from methylidenemalonate and olefin in 17% overall yield with >99/1 dr and 99% ee.
开发了一种高度非对映选择性和对映选择性 Cu(II)/SaBOX 催化的 [2+2] 环加成亚
甲基丙二酸酯和多取代烯烃,以高产率提供光学活性
环丁烷,产率 >99/1 dr 和高达 >99% ee。通过应用新开发的方法,从亚
甲基丙二酸酯和烯烃分八步完成了 (+)-
哌醋甲酯 B 的全合成,总产率为 17%,>99/1 dr 和 99% ee。