methyl 6-chloro-4-oxothiochroman-3-carboxylate 、
4-氯苯肼 、
对溴苯肼 以to yield 8-chloro-2-(4-chlorophenyl)-1,2,3,4-tetrahydro[1]benzothiopyrano[4,3-c]pyrazol-3-one (m.p. 237°-240° C.) and 8-chloro-2-(4-bromophenyl)-1,2,3,4-tetrahydro[1]benzothiopyrano[4,3-c]pyrazol-3-one (m.p. 257°-260° C.)的产率得到8-chloro-2-(4-chlorophenyl)-1,2,3,4-tetrahydro[1]benzothiopyrano[4,3-c]pyrazol-3-one