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A solution of 32.3 g (0.102 mole) of 2-[2-(phenylsulfonyl)ethyl]-1H-isoindole-1,3-(2H)-dione and 11.8 g (0.2 mole) of 85% hydrazine hydrate in 500 ml of absolute ethanol was refluxed for 6 hr. The reaction mixture was cooled to room temperature, filtered and concentrated. The concentrate was dissolved in chloroform and extracted with a 5% sodium hydroxide solution. The chloroform layer was dried and evaporated to give a clear oil. The oil (the free base of the title compound) was reacted with ethereal hydrogen chloride. Recrystallization of the precipitated salt from methanol-diethyl ether gave white crystalline product (40.5% yield), m.p. 151°-154° C.

1. filtrationfiltered
2. concentrationconcentrated
3. dissolutionThe concentrate was dissolved in chloroform
4. extractionextracted with a 5% sodium hydroxide solution
5. dry with materialThe chloroform layer was dried
6. customevaporated
7. customto give a clear oil