Hydrochloric Acid → HCID 54272299, compound

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Reaction Steps

Carbon disulphide (14 g.) is added dropwise, with vigorous stirring, to a solution of (R)-3-hydroxysulphonyloxymethyl-1,2,3,4-tetrahydroisoquinoline (33.9 g.) in 0.6N sodium hydroxide solution (1,000 cc.). After one hour at a temperature of about 20° C., a precipitate appears; stirring is continued for 15 hours. The mixture is neutralised by adding 4N hydrochloric acid. The crystals formed are filtered off and washed with water and then with ethanol. (R)-1,5,10,10a-Tetrahydrothiazolo[3,4-b]isoquinoline-3-thione (30.0 g.) is thus obtained in the form of white crystals melting at 150° C.

Provenance & Evidence