The enantioselective Kinugasareaction of nitrones with terminal alkynes in the presence of 20 mol % of IndaBox–Cu(OTf)2 and di-sec-butylamine (1.5 equiv) produced β-lactams with the highest level of enantiomeric excesses among the catalytic enantioselective Kinugasareactions reported so far.
Studies of multicomponent Kinugasa reactions in aqueous media
作者:Craig S. McKay、David C. Kennedy、John Paul Pezacki
DOI:10.1016/j.tetlet.2009.02.035
日期:2009.4
Micelle-promoted, copper-catalyzed multicomponent Kinugasa reactions were studied in aqueous media. Reactions were performed in a 'single pot' for a series of in situ generated C,N-diphenylnitrones with Cu(I) phenylacetylide providing beta-lactams in yields of 45-85%. Substituents affect the reaction by either accelerating cycloaddition or minimizing side reactions. (C) 2009 Elsevier Ltd. All rights reserved.