Enantiospecific synthesis of (+)-(1S,2R,6S)-1,2-dimethylbicyclo[4.3.0]nonan-8-one and (−)-7-epibakkenolide-A
作者:A. Srikrishna、T. Jagadeeswar Reddy
DOI:10.1016/s0040-4020(98)00672-3
日期:1998.9
oxidation, ozonation-Criegee rearrangement as key reactions. Intramolecular aldol condensation followed by catalytic hydrogenation converted the diketone 12 into the bicyclic ketone (+)-3, the optical antipode of the compound derived from the sesquiterpenes bakkenolide-A and fukinone. A 5-exo-dig radical cyclisation based strategy transformed the bicyclic ketone 3 into chiral 7-epibakkenolide-A.
描述了从R-香芹酮开始的标题中提及的手性双环酮的合成,以及其向7-表柏油基内酯-A的合成。将二甲基铜锂共轭添加到R-香芹酮中,然后烷基化中间烯醇化物,生成烯丙基化的化合物6,该化合物通过一系列反应(包括区域特异性Wacker氧化,臭氧化-Criegee重排作为关键反应)转化为二酮12。分子内羟醛缩合,然后进行催化氢化,将二酮12转化为双环酮(+)- 3,这是倍半萜烯bakkenolide-A和fukinone衍生的化合物的旋光对映体。5- exo-dig基于自由基环化的策略将双环酮3转化为手性7-表柏油基内酯-A。