Methylamine → 4-Chloro-6-methyl-2-(2-methylamino-ethylamino)-10,10-dioxo-10,11-dihydro-5-oxa-10lambda*6*-thia-dibenzo[a,d]cycloheptene-8-carboxylic acid methyl ester

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Reaction Conditions

Reaction Steps

A 30% methanolic methylamine solution (4 mL) was added to a solution of the carboxylic acid of Example 56k (0.5 g, 1.16 mmol) in methanol, in a pressure reactor vessel under nitrogen atmosphere and kept at 110° C. for 4 h. The reaction mixture was cooled, concentrated partially and the solid that precipitated was filtered, washed with methanol, dried, treated with methanolic HCl solution (10 mL) and stirred at 70° C. for 1.5 h. The reaction mixture was cooled and the solid that precipitated was filtered and washed with methanol to obtain the title compound as an off white solid. Yield: 0.325 g, (65.92%); 1H NMR (DMSO-d6): δ 2.50 (d, 3H, CH3), 2.80 (s, 3H, CH3), 3.10 (t, 2H, CH2), 3.30 (t, 2H, CH2), 3.90 (s, 3H, OCH3), 5.10 (s, 2H, CH2), 6.85-6.90 (m, 2H, Ar), 8.10 (s, 1H, Ar), 8.20 (s, 1H, Ar), 9.0 (t, 1H, NH); MS: m/e (ES+) 425 (M+).

Provenance & Evidence