Benzylamine → tert-butyl(1R)-1-benzyl-2-(benzylamino)ethylcarbamate

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Reaction Conditions

Reaction Steps

The product from Example 70A (1.77 g, 7.6 mmol) in toluene (15 mL) was treated with benzylamine (8.4 mL, 76 mmol) in a sealed tube. After heating at 100° C. for 4 days, the mixture was allowed to cool to ambient temperature and was concentrated. The residue was dissolved in ethyl acetate (50 mL) and the ethyl acetate was washed with 10% citric acid (2×50 mL) and brine (50 mL). A precipitate fell out of the brine. The brine wash was filtered and the filter cake dissolved in ethyl acetate. All the ethyl acetate solutions were combined, wash with aqueous 10% NaHCO3 (2×100 mL), brine, (100 mL), dried over magnesium sulfate, filtered, and the filtrate was concentrated to provide the title compound as a white solid (2.58 g). 1H NMR (CDCl3) δ 7.49-7.12 (m, 10H), 4.98 (m, 1H), 4.00 (br s, 1H), 3.87 (q, 2H), 2.94-2.73 (m, 5H); MS (ESI+) m/z 341 (M+H)+.

Provenance & Evidence