反应详情

A solution of (−)-7-(5-fluoro-2-methylphenyl)-5-guanidinoimino-4-methyl-5,6,7,8-tetrahydroquinoline (1.5 g) in ethanol (20 ml) was combined with concentrated hydrochloric acid (1.2 ml) and concentrated. The resultant crystal was recrystallized from a solvent mixture of ethanol and water to obtain (−)-7-(5-fluoro-2-methylphenyl)-5-guanidinoimino-4-methyl-5,6,7,8-tetrahydroquinoline hydrochloride (Compound E) (0.96 g, 99.3% ee). (This compound was proven to have an absolute configuration of an S form based in an X-ray crystal structure analysis.)

1. concentrationconcentrated
2. customThe resultant crystal was recrystallized from a solvent mixture of ethanol and water