Catalytic enantioselective Steglich rearrangements using chiral N-heterocyclic carbenes
作者:Craig D. Campbell、Carmen Concellón、Andrew D. Smith
DOI:10.1016/j.tetasy.2011.04.001
日期:2011.4
The evaluation of a range of enantiomerically pure NHCs, prepared in situ from imidazolinium or triazolium salt precatalysts, to promote the catalytic enantioselective Steglich rearrangement of oxazolyl carbonates to their C-carboxyazlactones, is reported. Modest levels of enantioselectivity (up to 66% ee) are observed using oxazolidinone derived NHCs. (C) 2011 Elsevier Ltd. All rights reserved.