反应详情

To a solution of 2,3,5,6-tetrahydro-1H-pyrrolo[2,1-a]isoquinolinium chloride (prepared by the method of S. Akaboshi, T. Kutsuma, and K. Achiwa, J. Pharm. Bull., 1960, 8, 14, from N-(2-phenylethyl)-4-chlorobutyramide (56.4 g, 0.25 mol) and extracted into isopropanol-dichloromethane) in methanol (700 ml) and acetic acid (50 ml) at 0° C. was added portionwise sodium cyanoborohydride (19 g) over 1 h. After stirring overnight, the solvent was concentrated in vacuo. The residue was dissolved in dilute sodium hydroxide and was extracted twice with dichloromethane. The dried (magnesium sulfate) organic phase was concentrated to give an oil which was distilled using a Kugelrohr distilling apparatus, b.p. 100° C. at 0.25 mm, to give the title compound (30.4 g, 70%) as a pale yellow oil.

1. concentrationthe solvent was concentrated in vacuo
2. dissolutionThe residue was dissolved in dilute sodium hydroxide
3. extractionwas extracted twice with dichloromethane
4. dry with materialThe dried (magnesium sulfate) organic phase
5. concentrationwas concentrated
6. customto give an oil which
7. distillationwas distilled
8. distillationdistilling apparatus, b.p. 100° C. at 0.25 mm