作者:Indukuri V.S. Kumar、Gorantla S. Ramanjaneyulu、Vurimindi H. Bindu
DOI:10.2174/157017811799304304
日期:2011.11.1
Synthesis of Sildenafil by the O-alkylation of 5-[2-hydroxy-5-(4-methylpiperazin-1-ylsulphonyl)phenyl]-1- methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo-[4,3-d]pyrimidin-7-one 8 proved difficult because concomitant alkylation of the pyrimidine moity also occurred. The selective O-alkylation was carried by DCC assisted decarboxilative etherification of the carbonate 9.
通过5- [2-羟基-5-(4-甲基哌嗪-1-基磺酰基)苯基] -1-甲基-3-正丙基-1,6-二氢-7H-吡唑并-的O-烷基化合成西地那非[4,3-d]嘧啶-7- 1 8被证明是困难的,因为同时发生了嘧啶部分的烷基化。选择性的O-烷基化是通过DCC辅助碳酸酯9的脱羧醚化进行的。