(3R,7R)-1-Dimethylamino-5-ethoxycarbonyl-3-(4-methoxy-phenyl)-2,7-dimethyl-6-oxo-2,7,8,9-tetrahydro-3H,6H-2,6a-diaza-3a-azonia-phenalene; chloride 在
sodium hydrogensulfite 作用下,
以
水 为溶剂,
以80%的产率得到(2R,8R,11R,12R)-4-dimethylazaniumylidene-11-ethoxycarbonyl-2-(4-methoxyphenyl)-3,8-dimethyl-10-oxo-1,3,9-triazatricyclo[7.3.1.05,13]tridec-5(13)-ene-12-sulfonate