One-Pot Synthesis of Functionalized 2H-Chromene (=2H-1-Benzopyran) Derivatives via a Three-Component Reaction between a CH-Acid, a Dialkyl Acetylenedicarboxylate, and Methyl Chloroglyoxylate or Benzyl Carbonochloridate Mediated by Triphenylphosphine
作者:Mohammad Bayat、Nader Zabarjad Shiraz、Soheila Shafei Asayesh
DOI:10.1002/hlca.201000030
日期:2010.11
An effective route to functionalized 2H‐chromene (=2H‐1‐benzopyran) derivatives 4 is described (Scheme 1). This involves the reaction of a 1,1‐diactivated alkene, resulting from the reaction of dimedone (=5,5‐dimethylcyclohexane‐1,3‐dione; 1a) with methyl chloroglyoxylate (ClC(O)COOMe), benzyl carbonochloridate (ClC(O)OCH2Ph) or 3,5‐dinitrobenzoyl chloride (3,5‐(NO2)2C6H3C(O)Cl), and a dialkyl
描述了一种功能化的2 H-色烯(= 2 H -1-苯并吡喃)衍生物4的有效途径(方案1)。这涉及1,1-双活化烯烃的反应,这是由二甲酮(= 5,5-二甲基环己烷-1,3-二酮; 1a)与氯乙醛酸甲酯(ClC(= O)COOMe),苄基氯代氯酸( ClC(O)OCH 2 Ph)或3,5-二硝基苯甲酰氯(3,5-(NO 2)2 C 6 H 3 C(O)Cl)和乙炔基二羧酸二烷基酯(=二烷基丁-2-炔二酸酯) )在存在分子内Wittig反应以生成2的Ph 3 P存在下H-色烯衍生物(方案1)。