(2R,3R,4R,5S)-1-butyl-2-(hydroxymethyl)piperidine-3,4,5-triol

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution obtained by mixing N-butyl 2,3,4,6-tetra-O-benzyl-1,5-dideoxy-1,5-imino-D-glucitol of formula (III), obtained as in Example 2 (105.1 g, 0.17 mol) in methanol (500 mL) in the presence of 32% HCl (43.5 g), is treated with 16% Pd/C (10.2 g). The mixture is maintained under vigorous stirring under hydrogen atmosphere at 4 bars for about 4 hours, and then filtered through a perlite panel, and the solution obtained is concentrated at low pressure. The solid residue thus obtained is dissolved in water (100 mL), and the acid solution obtained is passed through a column on an ion-exchange resin activated in basic form (Amberlite IRA 900Cl). The fractions that tested positive to the ninhydrin assay were combined and concentrated at low pressure, obtaining 50 g of miglustat as an oily residue, having a chemical purity exceeding 98%, calculated by HPLC. A solution obtained The mixture is maintained filtered through a perlite panel the solution obtained is concentrated at low pressure The solid residue thus obtained the acid solution obtained concentrated at low pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution obtained by mixing N-butyl 2,3,4,6-tetra-O-benzyl-1,5-dideoxy-1,5-imino-D-glucitol of formula (III), obtained as in Example 2 (105.1 g, 0.17 mol) in methanol (500 mL) in the presence of 32% HCl (43.5 g), is treated with 16% Pd/C (10.2 g). The mixture is maintained under vigorous stirring under hydrogen atmosphere at 4 bars for about 4 hours, and then filtered through a perlite panel, and the solution obtained is concentrated at low pressure. The solid residue thus obtained is dissolved in water (100 mL), and the acid solution obtained is passed through a column on an ion-exchange resin activated in basic form (Amberlite IRA 900Cl). The fractions that tested positive to the ninhydrin assay were combined and concentrated at low pressure, obtaining 50 g of miglustat as an oily residue, having a chemical purity exceeding 98%, calculated by HPLC. A solution obtained The mixture is maintained filtered through a perlite panel the solution obtained is concentrated at low pressure The solid residue thus obtained the acid solution obtained concentrated at low pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution obtained by mixing N-butyl 2,3,4,6-tetra-O-benzyl-1,5-dideoxy-1,5-imino-D-glucitol of formula (III), obtained as in Example 2 (105.1 g, 0.17 mol) in methanol (500 ml) in the presence of 32% HCl (43.5 g). is treated with 16% Pd/C (10.2 g). The mixture is maintained under vigorous stirring under hydrogen atmosphere at 4 bars for about 4 hours, and then filtered through a perlite panel, and the solution obtained is concentrated at low pressure. The solid residue thus obtained is dissolved in water (100 ml), and the resulting acid solution is passed through a column on an ion-exchange resin activated in basic form (Amberlite IRA 900Cl). The fractions that tested positive to the ninhydrin assay were combined and concentrated at low pressure, obtaining 50 g of miglustat as an oily residue, having a chemical purity exceeding 98%, calculated by HPLC. A solution obtained The mixture is maintained filtered through a perlite panel the solution obtained is concentrated at low pressure The solid residue thus obtained concentrated at low pressure