Incorporation of Sulfur Dioxide into the Products of Reaction ofSchiff Bases with Halo- or Alkylthio-ketenes in Liquid SO2. Preliminary communication
作者:Daniel Bellu?
DOI:10.1002/hlca.19750580832
日期:1975.11.5
A simple ‘three-component-reaction’ between halo- or alkylthio-ketenes, Schiff bases and sulfurdioxide, yielding 4-oxo-1,3-thiazolidine-1,1-dioxides 4 in one step, is presented.
An efficient use of triphosgene, as an acid activator, for the synthesis of substituted azetidin-2-ones via ketene-imine cyclo-addition reaction using various acids and imines have been described. (C) 2002 Elsevier Science Ltd. All rights reserved.