Hydrochloric Acid → HCID 20395796, compound

Participants

Reaction Steps

20.0 g. of pyridine hydrochloride are added to 6.0 g. of 1-cyano-3-imino-8,9-dimethoxy-3,4,5,6-tetrahydro-1,3-thiazolo[4,3-a]isoquinoline hydrochloride, and the mixture is kept for 2 hours in an oil bath of 210°-220° C. The mixture is cooled and a mixture of 6 ml. of concentrated hydrochloric acid and 14 ml. of water is added. 5.2 g. of crystalline 1-cyano-3-imino-8,9-dihydroxy-3,4,5,6-tetrahydro-1,3-thiazolo[4,3-a]isoquinoline hydrochloride dihydrate are obtained; m.p.: gradually decomposes from 280° C. (after recryltallization from hot water).

Provenance & Evidence