反应详情

The diol (17) (580 mg, 1.2 mmol) was stirred in glacial acetic acid (30 ml) in the presence of palladium black (100 mg) under hydrogen for 3 days, by which time no starting material (Rf 0.2) remained by t.l.c. (diethyl ether). Filtration and removal of the solvent then gave a gum which was purified by ion exchange chromatography with Dowex 50(H+) followed by Amberlite CG-400(Cl-) resins to give 1,5-dideoxy-1,5-imino-D-glucitol (3) (188 mg, 95%), which was crystallized as its hydrochloride salt. m.p. 204°-205° C. (lit.* 203°-206° C.). All spectroscopic data were identical to that of authentic material. --C NMR (D2O) free base δ: 79.0, 72.1, 71.1 (3d, C-2, C-3, C-4), 61.9 (t, C-6), 61.0 (d, C-5), 49.2 (t, C-1). Hydrogen chloride salt δ: 77.1, 68.6, 67.8 (3d, C-2, C-3, C-4), 60.8 (d, C-5), 58.5 (t, C-6), 46.7 (t, C-1). [*Fleet et al., Tetrahedron 43, 979 (1987)].

1. filtrationFiltration and removal of the solvent
2. customthen gave a gum which
3. customwas purified by ion exchange chromatography with Dowex 50(H+)