A simple and efficient synthesis of isocoumarins and alkylidenephthalides from 3-(1-hydroxycarbethoxy/alkyl)phthalides with a DEAD/PPh<sub>3</sub>/TBHP system
作者:Sunita K. Gadakh、Arumugam Sudalai
DOI:10.1039/c4ra10372f
日期:——
to the synthesis of 3-carbethoxy-isocoumarins and 3-alkylidenephthalides is described. The methodology employs DEAD/PPh3/TBHP as the reagent system proceeding through unprecedented 1,2-shift intramolecular ring expansion or simple elimination depending upon substituents present on 3-substituted phthalides, with broader substrate scope. This strategy is amply demonstrated in the short synthesis of bioactive
描述了一种简便且新颖的合成3-乙氧基-异香豆素和3-亚烷基萘的方法。该方法采用DEAD / PPh 3 / TBHP作为试剂体系,这是通过空前的1,2-位移分子内环扩环或简单消除(取决于3-取代邻苯二甲酸酯上存在的取代基)进行的,具有更宽的底物范围。这种策略在诸如细胞分裂素和(Z)-3-丁烯-7-羟基-5-甲氧基邻苯二酚的生物活性分子的短合成中得到了充分证明。