Dichloromethane → (E)-3-[4-(3-Morpholin-4-yl-propyl)-2-oxo-2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl]acrylic acid hydrochloride

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Reaction Steps

A solution of (E)-3-[4-(3-Morpholin-4-yl-propyl)-2-oxo-2,3,4,5-tetrahydro-1H-pyrido[2,3-e][1,4]diazepin-7-yl]acrylic acid tert-butyl ester (2.21 g, 5.30 mmol) in CH2Cl2 (20 mL) was treated with TFA (20 mL). After stirring at room temperature for 30 min, the solution was concentrated in vacuo. The resulting oil was treated with anhydrous HCl (50 mL of a 4.0 M solution in dioxane, 200 mmol) and the mixture was sonicated for 1.5 h. The mixture was diluted with Et2O (200 mL) and sonicated for 15 min. The solid was isolated by filtration, washed with Et2O, and dried under vacuum at 50° C. for 5 h to give the title compound (3.08 g, quantitative) as an off-white solid: 1H NMR (500 MHz, DMSO-d6) δ 11.23 (br s, 2H), 8.74 (s, 1H), 8.36 (s, 1H), 7.63 (d, J=15.9, 1H), 6.63 (d, J=16.0 Hz, 1H), 4.33 (br s, 2H), 3.90 (br s, 6H), 3.24 (m, 8H), 2.22 (br s, 2H); MS (ESI) m/e 361 (M+H)+.

Provenance & Evidence