Synthesis of Polysubstituted Bicyclo[3.3.1]nonane-3,7-diones from Cyclohexa-2,5-dienones and Dimethyl 1,3-Acetonedicarboxylate
作者:Pelayo Camps、Albert González、Diego Muñoz-Torrero、Montserrat Simon、Adriana Zúñiga、Miriam A. Martins、Mercè Font-Bardia、Xavier Solans
DOI:10.1016/s0040-4020(00)00680-3
日期:2000.10
Oxidation of polysubstituted phenols with phenyliodonium diacetate gives cyclohexa-2,5-dienones, which on reaction with dimethyl 1,3-acetonedicarboxylate afford double-Michael-addition derivatives, whose hydrolysis and decarboxylation provides polysubstituted bicyclo[3.3.1]nonane-3,7-diones. For steric and/or electronic reasons, the Michael reaction only works with 3,5-unsubstituted or 3-substituted
用二乙酸苯基碘铵氧化多取代的苯酚可得到环己2,5-二烯酮,与1,3-丙酮二羧酸二甲酯反应可得到双Michael加成衍生物,其水解和脱羧反应可得到多取代的双环[3.3.1] nonane-3, 7-diones。由于空间和/或电子原因,如果取代基不是释放电子的基团或良好的吸电子基团,则迈克尔反应仅与3,5-未取代或3-取代的环己-2,5-二烯酮一起起作用。来自2,4,4-或2,4,4,6-取代的环己-2,5-二壬烯的双迈克尔加合物的水解和脱羧仅产生部分水解和脱羧的产物,其仅以烯醇形式存在。