A straightforward sequence to alkyl 1H-pyrrole-2,5-dicarboxylates starting from acylhydrazono esters and alkyl 2-aroyl-1-chlorocyclopropanecarboxylates
作者:Zhimei Huang、Yuefa Gong
DOI:10.1039/c6ra01829g
日期:——
A highly regioselective domino reaction was developed between alkyl 2-aroyl-1-chlorocyclopropanecarboxylates 1 and acylhydrazono esters 2 in the presence of Cs2CO3 under mild basic conditions, which directly afforded 2,3,5-trifunctionalized pyrroles in good to excellent yields with the extrusion of benzamide. A plausible pathway was proposed involving 1,2-elimination, regioselective nucleophilic addition
在温和的碱性条件下,在Cs 2 CO 3存在下,烷基2-芳酰基-1-氯环丙烷羧酸酯1和酰基肼基甲酸酯2之间发生了高度区域选择性的多米诺反应,从而直接提供了2,3,5-三官能化吡咯,收率很好与苯甲酰胺的挤出。提出了一条可行的途径,涉及1,2-消除,区域选择性亲核加成,分子内曼尼希反应和苯甲酰胺的去除,以合理化芳族吡咯体系的形成。
Oxidation of 2-Arylglyoxal 1-Aroylhydrazones with Lead(IV) Acetate<sup>1</sup>; Preparation of Unsymmetrically Substituted Triacylhydrazines
作者:Nestor A. Rodios、Nicholas E. Alexandrou
DOI:10.1055/s-1982-29955
日期:——
Korotkikh,N.I. et al., Journal of Organic Chemistry USSR (English Translation), 1979, vol. 15, p. 860 - 867