1H-吡唑-5-胺,1-甲基-4-亚硝基-3-(2-噻嗯基)- 在
钯 Arbocel 作用下,
以
乙醇 为溶剂,
反应 2.0h,
以to give the title compound as a red-brown solid (1.133 g, 97%), m.p. 154°-155° C.的产率得到4,5-diamino-1-methyl-3-(2-thienyl)pyrazole
Platelet activating factor antagonists of formula (I), (II) or (III): ##STR1## where A is optionally substituted benzene, pyridine, naphthalene, quinoline, thiophene, benzothiophene, pyrazole or isothiazole, X is O, S or NH Y is 1,4 phenylene or a group of formula ##STR2## R.sup.1 is H or optionally substituted C.sub.1 -C.sub.4 alkyl, R.sup.2 and R.sup.3 are H or C.sub.1 -C.sub.4 alkyl, B is an optionally fused 5- or 6-membered ring containing nitrogen atoms, Het is an optionally substituted 5-membered heterocyclic ring containing nitrogen or a pyridine ring, the ring optionally being fused to benzene or nitrogen-containing heterocyclic ring.