Highly Selective α-Acylvinyl Anion Additions to Imines
作者:Troy E. Reynolds、Michael S. Binkley、Karl A. Scheidt
DOI:10.1021/ol802227t
日期:2008.11.20
alpha-Hydroxypropargylsilanes undergo rearrangement to form reactive lithium allenolates. The resulting alpha-acylvinyl anion equivalents undergo highly selective additions to N-tert-butanesulfinyl imines generating beta-substituted aza-MBH-type products. High yields are achieved for a wide range of alpha-hydroxypropargylsilanes as well as for a diverse selection of imines. The reactions proceed with good
Zinc-Salen-Catalyzed Asymmetric Alkynylation of Alkyl Acylsilanes
作者:Feng-Quan Li、Shi Zhong、Gui Lu、Albert S. C. Chan
DOI:10.1002/adsc.200900177
日期:2009.8
synthesis, and their direct access by enantioselective addition of alkyne nucleophiles to ketones has achieved significant progress over the last ten years. In view of the potential applications of acylsilanes as useful synthetic equivalents of aldehydes, we described a general catalytic enantioselective addition of terminal alkynes to alkyl acylsilanes. After reaction optimization involving variation