反应详情

To a solution of 4-benzyl-2-(toluene-p-sulphonyloxy)methylmorpholine (18.1 g.) in methanol (100 ml.) is added a solution of (+)-toluene-p-sulphonylglutamic acid (16.0 g.) in methanol (50 ml.) and the mixture is allowed to crystallise during 12 hours. The mixture is filtered and the residue (18.3 g.) is recrystallized from methanol (150 ml.) to obtain the (+)-toluene-p-sulphonylglutamic acid salt of (2S)-4-benzyl-2-(toluene-p-sulphonyloxy)methylmorpholine (14.0 g.), m.p. 184°C. This salt is stirred with a mixture of 2N sodium hydroxide and ether. The ether layer is separated, dried and the ether is distilled to leave optically pure (2S)-4-benzyl-2-(toluene-p-sulphonyloxy)methylmorpholine as an oil from which is prepared the hydrochloride, m.p. 150°C., [α]D25 + 19.4° (c,5 in methanol).

1. customto crystallise during 12 hours
2. filtrationThe mixture is filtered
3. customthe residue (18.3 g.) is recrystallized from methanol (150 ml.)