Acetic Acid → t-Butyl 4'-[[3(R)-[[3-amino-3-methyl-l-oxobutyl]amino]-2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-1-yl]methyl][1,1'-biphenyl]-2-carboxylate acetate

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Reaction Steps

To a solution of 400 mg (0.592 mmol) of t-butyl 4'-[[3(R)[[3-benzyloxycarbonylamino-3-methyl-1-oxobutyl]amino]-2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-1-yl]methyl][1,1'-biphenyl]-2-carboxylate (prepared according to the procedure of Fisher et al, U.S. Pat. No. 5,206,235) in 10 mL of methanol was added 0.034 mL (0.59 mmol) of acetic acid and 80 mg (20% w/w) palladium hydroxide. The resulting mixture was stirred under a hydrogen atmosphere for 4 hours. Catalyst was removed by filtration through Celite and the solvent removed under vacuum to afford 345 mg (97%) of the product as a white solid. 1H NMR (400 MHz, CD3OD): δ1.17 (s, 9H), 1.37 (s, 3H), 1.41 (s, 3H), 1.92 (s, 3H), 2.17 (m, 1H), 2.35 (m, 1H), 2.45-2.75 (m, 4H), 4.41 (dd; 12, 8 Hz; 1H), 4.93 (d, 15 Hz, 1H), 5.37 (d, 16 Hz, 1H), 7.12-7.52 (m, 11H), 7.66 (d, 8 Hz, 1H). FAB-MS: calculated for C33H39N3O4 541; found 542 (M+H,100%).

Provenance & Evidence