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

HRID 2121176Notes

Reaction equation

[CH3:1][O:2][C:3](=[O:25])[C@H:4]([CH2:21][CH2:22][S:23][CH3:24])[NH:5][C:6](=[O:20])[C:7]1[CH:12]=[CH:11][C:10]([NH2:13])=[CH:9][C:8]=1[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[N:26]1[CH:31]=[CH:30][CH:29]=[C:28]([CH:32]=O)[CH:27]=1.C([BH3-])#N.[Na+].C(O)(=O)C>CO>[CH3:1][O:2][C:3](=[O:25])[C@H:4]([CH2:21][CH2:22][S:23][CH3:24])[NH:5][C:6](=[O:20])[C:7]1[CH:12]=[CH:11][C:10]([NH:13][CH2:32][C:28]2[CH:27]=[N:26][CH:31]=[CH:30][CH:29]=2)=[CH:9][C:8]=1[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1

Participants

Conditions

Temperature: 25 °C

Procedure

(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.

Workup

customby crushed molecular sieves
concentrationThe reaction was concentrated
custompurified by flash chromatography (5%methanol-ethyl acetate)

Sources & evidence

ORD record: ord-19b830adf78d45f4a3daf1166703ba68
Source dataset: uspto-grants-2004_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06693123B2

Reaction notes

Loading…