Stereospecific Synthesis of <i>cis</i>-2,5-Disubstituted Pyrrolidines via <i>N</i>,<i>O</i>-Acetals Formed by Hydroamination Cyclization–Hydroalkoxylation of Homopropargylic Sulfonamides in HFIP
作者:Weilin Wang、Xiaohui Cao、Weiguo Xiao、Xiaoyu Shi、Xiaodan Zuo、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1021/acs.joc.0c00403
日期:2020.6.5
5-cis-disubstituted pyrrolidines with high diastereoselectivity (up to >99:1 dr) and enantioselectivity (up to >99% ee). The overall reaction constitutes a formal 1,1-bifunctionalization of terminal alkynes, which has hitherto been reported only rarely. Additionally, this method provides efficient access to pharmaceutical intermediate and to carry out postmodification of natural products.
A novel hypervalent iodine-triggered hydroamination of homopropargyl sulfonamides with copper halides to obtain dihalo-2,3-dihydropyrroles was efficiently developed.