An Improved Synthetic Route to Angularly Functionalized Hydrofluorene Derivatives through Pd(0)-Catalyzed Heck Reaction
作者:Asish Banerjee、Mainak Banerjee、Ranjan Mukhopadhyay、Basudeb Achari
DOI:10.1055/s-2006-926408
日期:2006.4
4a-Substituted 1,1-dimethyl or 1-carbomethoxy-1-methyl hydrofluorenes carrying various substituents in the aromatic ring could be conveniently synthesized by Pd(0)-catalyzed Heck reaction. The required bromobenzyl-substituted ethylidene cyclohexane substrates were derived from Hagemann's ester (methyl analogue) via condensation with appropriate benzyl bromide, hydrolytic decarboxylation of the ester
4a-取代的1,1-二甲基或1-碳甲氧基-1-甲基氢芴在芳环上带有各种取代基,可以通过Pd(0)催化的Heck反应方便地合成。所需的溴苄基取代的亚乙基环己烷底物衍生自哈格曼酯(甲基类似物),通过与适当的苄基溴缩合、酯的水解脱羧、甲基或氰基的 1,4-加成,然后进行必要的官能团操作,以及 Wittig 烯化. 简单的有机转化将乙烯基转化为羧基、甲酰基或羟甲基。产物的环接合立体化学可以通过相关方法确定。