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Step C) Formation of N-Boc-(4-hydroxymethyl)benzylamine; To a suspension of LAH (8. 6 g, 0.226 mol) in dry THF (700 mL) was added a solution of methyl (N-Boc-4-aminomethyl)benzoate (50 g, 0. 188 mol) in THF (300 ML) AT-40°C with stirring and stirred for 6 h. The reaction mixture was quenched with an aqueous NAOH solution (10percent of 40 mL) AT-30°C. The reaction mixture was filtered, washed with THF and concentrated under vacuum to give the title compound as white solid (41 g, 91percent).
35%
To a cold suspension of LiAlH4 (60 mg, 1.5 mmol) in ether (5 mL) at -78° C. was added dropwise a solution of methyl 4-(N-t-Boc-aminomethyl)benzoate (0.8 g, 3 mmol) in ether (5 mL) and the contents were allowed to warm-up to ambient temp. After 3 h, further amount of LiAlH4 (100 mg) was added and the reaction was continued at room temp for further 10 min. Excess LiAlH4 was destroyed with EtOAc followed by saturated ammonium chloride (1.0 mL), The solid precipitated was filtered and washed with ether. The filtrate was evaporated to give 4-(N-t-Boc-aminomethyl)benzyl alcohol (250 mg, 35percent).
Reference Example 63 tert-Butyl 4-hydroxymethylbenzylcarbamate Diisobutylaluminum hydride (25.7 ml, 0.93 M hexane solution) was added dropwise to a THF solution (40 ml) of methyl 4-[N-(tert--butoxycarbonyl)aminomethyl]benzoate (2.54 g) at -78°C, followed by stirring at the same temperature for 2 hours. A saturated aqueous ammonium chloride solution (10 ml) and diethyl ether were added dropwise to the reaction solution, followed by stirring at room temperature for 1 hour. Magnesium sulfate was added to the reaction solution, followed by further stirring for 1 hour. After removal of the resulting precipitate by filtration trough celite, the filtrate was concentrated, the thus obtained residue was purified by silica gel column chromatography, and the title compound (1.22 g) was obtained as a colorless oil from the fraction of the elude of n-hexane: ethyl acetate = 10:3. 1H-NMR (400 MHz, CDCl3) delta: 1.43 (9H, s), 4.29 (2H, d, J=5.6 Hz), 4.67 (2H, d, J=5.9 Hz), 4.87 (1H, bs), 7.25 (2H, d, J=8.1 Hz), 7.32 (2H, d, J=8.1 Hz).
The compound (35.7 g) obtained in Example 23-1 was dissolved in anhydrous THF (800 ml) and added with Lithium aluminum hydride (10.2 g) in an ice bath and the whole was stirred for 2 days under a nitrogen atmosphere. After completion of the reaction, methanol and then an aqueous sodium potassium tartrate solution were added thereto and the whole was stirred overnight. The resultant was subjected to extraction with chloroform and washed with saturated saline solution. The organic layer was dried with anhydrous sodium sulfate. The solvent was distilled off, thereby obtaining the subject compound (29.2 g) as a colorless crystal.
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