Methyl 3-{2-[(acetyloxy)methyl]-4-[(tert-butoxycarbonyl)amino]-3-methylphenyl}-2-{[(benzyloxy)carbonyl]amino}prop-2-enoate → 3-(2-Acetoxymethyl-4-tert-butoxycarbonylamino-3-methyl-phenyl)-2-(R)-benzyloxycarbonylamino-propionic acid methyl ester

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A solution of 3-(2-acetoxymethyl-4-tert-butoxycarbonylamino-3-methyl-phenyl)-2-benzyloxycarbonylamino-acrylic acid methyl ester (2.51 g, 4.9 mmol) in methanol (50 mL) and ethyl acetate (15 mL) was reacted in a manner similar to the preparation of 2-(S)-(acetoxymethyl-4-tert-butoxycarbonylamino-3-methyl-benzyl)-succinic acid diethyl ester. Title compound was obtained as an off-white solid in 97% yield. 1H NMR (300 MHz, CDCl3): δ=7.66 (d, J=7.9, 1H), 7.31 (m, 5H), 6.99 (d, J=8.5, 1H), 6.21 (s, 1H), 5.31 (d, J=7.6, 1H), 5.17 (d, J=3.7, 2H), 5.04 (d, J=5.80, 2H), 4.56 (m, 1H), 3.71 (s, 3H), 3.23 (dd, J1=5.80, J2=14.7, 1H), 3.07 (dd, J1=7.8, J2=14.2, 1H), 2.21 (s, 3H), 2.00 (s, 3H), 1.50 (s, 9H). MS m/e (M−H)−=513.0.

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