反应详情

A solution of 1.3 g. of S-methyl-isothiourea sulfate in 5 ml. of water at about 20° C. was added to 1.2 g. of 4-hydroxy-1,2,3,4-tetrahydroisoquinoline. The resulting mixture was maintained at about 25°-30° C. with occasional shaking. After a short time, methyl-mercaptan began to escape and, upon standing for 1-2 days, crystals formed. The crystals were removed by filtration and rinsed with ice-cold water and with ether. Recrystallization from water yielded 2-amidino-4-hydroxy-1,2,3,4-tetrahydroisoquinoline sulfate, having a melting point of 264°-266° C. (uncorrected).

1. temperatureThe resulting mixture was maintained at about 25°-30° C. with occasional shaking
2. customcrystals formed
3. customThe crystals were removed by filtration
4. washrinsed with ice-cold water and with ether
5. customRecrystallization from water