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.
One-pot Preparation of Homopropargylic <i>N</i>-Sulfonylamines Catalyzed by Zinc Powder
作者:Chao Wu、Wangyong Huang、Weimin He、Jiannan Xiang
DOI:10.1246/cl.130626
日期:2013.10.5
A new one-pot method for synthesis of homopropargylic N-sulfonylamines from aldehydes catalyzed by zinc powder is described. The procedure is lauded by its simplicity, good yields, and adaptability to a wide variety of aldehydes.
A novel hypervalent iodine-triggered hydroamination of homopropargyl sulfonamides with copper halides to obtain dihalo-2,3-dihydropyrroles was efficiently developed.