Regioselectivity of Reactions of Nitrogen and Carbon Nucleophiles with Coumarin Derivatives
作者:Perry T. Kaye、Musiliyu A. Musa
DOI:10.1081/scc-200030643
日期:2004.1.1
Abstract Reaction of various 3‐substituted coumarins with nitrogen and carbon nucleophiles appears to involve, in all cases examined, exclusive, direct substitution at the exocyclic C‐1′ electrophilic center.
Efficient and Chemoselective Access to 3-(Chloromethyl)coumarins via Direct Cyclisation of Unprotected Baylis-Hillman Adducts
作者:Perry T. Kaye、Musiliyu A. Musa、Xolani W. Nocanda
DOI:10.1055/s-2003-37655
日期:——
Reaction of substituted 2-hydroxybenzaldehydes with t-butyl acrylate in the presence of DABCO has been shown to afford isolable Baylis-Hillman adducts, acid-catalysed cyclisation of which affords the corresponding 3-(chloromethyl)coumarins directly and in high yield.