作者:Berkeley W. Cue、John P. Dirlam、Leonard J. Czuba、Wendell W. Windisch
DOI:10.1002/jhet.5570180136
日期:1981.1
large-scale synthesis of the antibiotic pyoluteorin, 2,3-dichloro-5-(2′,6′-dihydroxybenzoyl)-pyrrole (1), is described. A key step in the synthesis involved a Friedel-Crafts aroylation of pyrrole with 2,6-dimethoxybenzoyl chloride (3) in methylene chloride. The desired intermediate, 2-(2′,6′-dimethoxybenzoyl)pyrrole (4), was obtained as the major product, along with a product of beta substitution (6). Compound
描述了一种方便,大规模合成的抗生素化脓性黄体素2,3-二氯-5-(2′,6′-二羟基苯甲酰基)-吡咯(1)。合成中的关键步骤涉及在二氯甲烷中用2,6-二甲氧基苯甲酰氯(3)对吡咯进行Friedel-Crafts芳构化。获得所需的中间体2-(2',6'-二甲氧基苯甲酰基)吡咯(4)以及β取代的产物(6)作为主要产物。分四步将化合物4转化为焦黄素(1),总收率51%。