Acetic Acid → [4(3-Pyridylmethylamino)-2-phenylbenzoyl]methionine methyl ester

Participants

Reaction Conditions

Reaction Steps

(4-Amino-2-phenylbenzoyl)methionine methyl ester (1.15 g, 3.21 mmol), prepared as in Example 192B, and 3-pyridine carboxaldehyde (361 mg, 3.37 mmol) were combined in 15 mL methanol and sodium cyanoborohydride (302 mg, 4.81 mmol) was added followed by crushed molecular sieves. The reaction was adjusted to pH=6 with acetic acid and stirred at 25° C. for 3 hours. The reaction was concentrated and transferred directly to a column of silica gel and purified by flash chromatography (5%methanol-ethyl acetate) to give [4(3-pyridylmethylamino)-2-phenylbenzoyl]methionine methyl ester (1.38 g, 95%) as an oil that solidified after standing. 1H NMR (300 mHz, CDCl3) δ 8.6 (d, 1H), 8.52 (dd, 1H), 7.72-7.65 (m, 2H), 7.45-7.30 (m, 6H), 6.62 (dd, 1H), 6.48 (d, 1H), 5.72 (bd, 1H), 4.64 (dq, 1H), 4.42 (bs, 2H), 3.64 (s, 3H), 2.25-2.05 (m, 3H), 2.00 (s, 3H), 1.95-1.80 (m, 1H), 1.72-1.60 (m, 1H); CIMS MH+ 450.

Provenance & Evidence