作者:Susana Villa Gonzalez、Per Carlsen
DOI:10.1002/ejoc.200700198
日期:2007.7
(3R,4R)-3,4-diacetoxypyrrolidine-2,5-dione was prepared from L-tartaric acid by ring closure of the ammonium salt of (2R,3R)-2,3-diacetoxy-3-carbamoylpropanoic acid with thionyl chloride. Mechanistic considerations indicate that the ring closure proceeds through two competing pathways: either direct ring closure of an intermediate acyl chloride or in a parallel route via a ketene intermediate. The cyclic
旋光性(3R,4R)-3,4-二乙酰氧基吡咯烷-2,5-二酮是由L-酒石酸通过(2R,3R)-2,3-二乙酰氧基-3-氨基甲酰基丙酸的铵盐闭环制备的与亚硫酰氯。机理考虑表明,环闭合通过两种竞争途径进行:中间体酰氯的直接环闭合或通过乙烯酮中间体的平行途径。环状产物分别通过水解和与合适的烷基胺反应进一步转化为旋光酒石单酰胺和酒石双酰胺。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)