Hydrochloric Acid → [4-Amino-2-(2-methylphenyl)benzoyl]methionine methyl ester hydrochloride

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Reaction Steps

[4-Nitro-2-(2-methylphenyl)benzoyl]methionine methyl ester was reduced to a corresponding amine by stannous chloride in ethyl acetate at 78° C. The free amine was treated with methylene chloride and 3 N HCl in ether to give [4-amino-2-(2-methylphenyl)benzoyl]methionine methyl ester hydrochloride (85% yield); [α]25D=−28.3 (c=1.0, methanol); 1H NMR (CD3OD) δ 7.74 (d, J=8.2 Hz, 1H), 7.47 (d, J=8.2 Hz, 1H), 7.23-7.30 (m, 5H), 4.47 (m, 1H), 3.69 (s, 3H), 2.06-2.18 (m, 4H), 1.99 (s, 3H), 1.97 (m, 2H), 1.74 (m, 1H); 13C NMR (CD3OD) δ 173.3, 170.8, 143.3, 139.7, 138.1, 137.2, 133.5, 131.49 130.8, 130.6, 129.6, 128.8, 126.2, 123.1, 66.9, 52.9, 31.5, 30.8, 20.4, 15.1.

Provenance & Evidence