1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (E)-3-(2,2-Dimethyl-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)-N-(3-methoxy-2-propoxy-benzyl)-N-methyl-acrylamide

Participants

Reaction Steps

To a solution of (3-methoxy-2-propoxy-benzyl)-methyl-amine (115 mg, 0.55 mmol) in DMF (5 mL) were added in sequential order 3-(2,2-dimethyl-3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazin-7-yl)-acrylic acid (181 mg, 0.5 mmol), 1-hydroxybenzotriazole (74 mg, 0.55 mmol), diisopropylethylamine (261 uL, 1.5 mmol), and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (110 mg, 0.55 mmol). The reaction was placed in a microwave at 130° C. for 5 min. The solution was cooled in an ice bath and water was added with rapid stirring. The precipitate was filtered, dried and triturated with diethyl ether to yield the title compound (164 mg, 75%) as a white solid and as a mixture of amide rotomers: 1H NMR (400 MHz, DMSO-d6) δ 11.37-11.39 (m, 1H), 8.14-8.18 (m, 1H), 7.87-7.93 (m, 1H), 7.47-7.53 (m, 1H), 7.27-7.34 (m, 1H), 6.92-7.09 (m, 3H), 6.60-6.66 (m, 1H), 4.62-4.79 (m, 2H), 3.84-3.90 (m, 2H), 3.78 (s, 3H), 2.88-3.09 (m, 3H), 1.70-1.74 (m, 2H), 1.40-1.49 (m, 6H), 0.93-0.99 (m, 3H); MS (ESI) m/e 440 (C24H29N3O5+H)+.

Provenance & Evidence