METHODS Terazosin hydrochloride was synthesized from anhydro-piperazine via acylation,reduction,amination,salification etc.

方法无水哌嗪起始原料,经化、还原、胺化、成盐反应制得盐酸特拉唑嗪。

METHODS Balsalazide disodium was synthesized by reactions of condensation , reduction, diazotization , coupling and salification from 4-nitrobenzoyl chloride.

方法对硝基苯甲起始原料,经缩合、还原、重氮化、偶合、成盐反应制得巴柳氮二钠。