N-(benzyloxycarbonyloxy)succinamide → tert-Butyl (1S,2R)-1-benzyl-2-hydroxy-3-[(3-methoxybenzyl)amino]propylcarbamate

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반응 단계

tert-Butyl (1S, 2R)-1-benzyl-2-hydroxy-3-[(3-methoxybenzyl)amino]propylcarbamate (VII, PREPARATION 8, 19.2 g, 48 mmole) in THF (100 ml). The reaction mixture is cooled to 0° and treated with N-benzyloxy carbonyloxysuccinamide (11.9 g, 48 mmole) while maintaining temperature <5°. The reaction mixture is stirred overnight and in the morning is concentrated under reduced pressure. The residue is partitioned between ethyl acetate and saturated aqueous bicarbonate. The organic phase is separated and washed with citric acid (5%), saline, dried over sodium sulfate and concentrated. The crude product is purified by preparatory HPLC eluting with a gradient of from 20/80–50/50 ethyl acetate. To give the title compound, M+H=534.

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