One-Pot Silyl Ketene Acetal-Formation Mukaiyama-Mannich Additions to Imines Mediated by Trimethylsilyl Trifluoromethanesulfonate
作者:C. Wade Downey、Jared A. Ingersoll、Hadleigh M. Glist、Carolyn M. Dombrowski、Adam T. Barnett
DOI:10.1002/ejoc.201500958
日期:2015.11
the presence of trimethylsilyl trifluoromethanesulfonate and trialkylamine base, thioesters are readily converted into silyl ketene acetals in situ and undergo Mukaiyama–Mannich addition to N-phenylimines in one pot. The silyl triflate appears to play two roles, activating both the thioester and the imine. This process also works well when thioesters are replaced with amides, esters, or ketones. Products
在三氟甲磺酸三甲基甲硅烷基酯和三烷基胺碱的存在下,硫酯很容易原位转化为甲硅烷基乙烯酮缩醛,并在一锅中对 N-苯基亚胺进行 Mukaiyama-Mannich 加成。甲硅烷基三氟甲磺酸酯似乎起到两个作用,激活硫酯和亚胺。当硫酯被酰胺、酯或酮取代时,该过程也能很好地工作。产品以脱甲硅烷基苯胺形式分离,无需脱保护步骤。收率范围为 65% 至 99%。