The cyanide catalyzed isomerization of enol esters derived from cyclic 1,3-diketones
作者:Imber Flores Montes、Ulrich Burger
DOI:10.1016/0040-4039(95)02362-3
日期:1996.2
Cross-over experiments unveil that the mechanism of the title reaction consists in cleavage of enol esters by cyanide with transient formation of acyl cyanides. These react as ‘soft’ C-acylating agents with the enolates freed in the initial step. Use is made of the acyl cyanide derived from pyrrole-2-carboxylic acid to set up the triketide type skeleton 12 of the antibiotic pyoluteorin 16. The aromatization
交叉实验揭示了标题反应的机理在于氰化物裂解烯醇酯并短暂形成酰基氰化物。这些作为“软” C-酰化剂与在初始步骤中释放出的烯醇化物反应。利用由吡咯-2-羧酸衍生的酰基氰化物来建立抗生素化脓性叶黄素16的三酮化合物型骨架12。用乙酸汞将12芳构化,得到吡咯并[a]吲哚酮18。