Experiments on the Synthesis of dl-Camptothecin. II. Synthesis of a D-E Ring Analog of Camptothecin and a Total Synthesis of Ricinine
作者:TSUTOMU SUGASAWA、KAZUYUKI SASAKURA、TATSUO TOYODA
DOI:10.1248/cpb.22.763
日期:——
A D-E ring analog (XX) of camptothecin (I) was synthesized from 4-methoxy-1-methyl-2 (1H)-pyridone by using Vilsmeier reaction followed by nucleophilic direct introduction of di-tert-butyl malonate onto the pyridone ring, ethylation and hydroxylation.
利用维尔斯梅尔反应,然后在吡啶酮环上亲核直接引入丙二酸二叔丁酯、乙基化和羟基化反应,从 4-甲氧基-1-甲基-2 (1H)-吡啶酮合成了喜树碱(I)的 D-E 环类似物(XX)。