Diisopropylethylamine → 2-Chloro-N-(4-methoxy-7-morpholin-4-yl-benzothiazol-2-yl)-isonicotinamide

Participants

Reaction Steps

To a stirred solution of 10.8 g (40.8 mmol) 4-methoxy-7-morpholin-4-yl-benzothiazol-2-ylamine and 17.3 ml (102 mmol) N-ethyldiisopropylamine in 500 ml THF at 5° C. was added dropwise over 90 minutes a solution of 7.90 g (44.9 mmol) 2-chloro-isonicotinoyl chloride in 250 ml dichloromethane and stirring continued at room temperature for 16 h. The reaction mixture was then quenched by addition of 30 ml methanol and concentrated in vacuo. The residue was then resuspended in ethyl acetate and washed sequentially with saturated sodium bicarbonate solution, 0.5 M hydrochloric acid and saturated brine. The organic phase was then dried over sodium sulfate and concentrated in Vacuo to ca 100 ml. The resulting suspension was then left standing at room temperature for 72 h and then 100 ml ether was added and the suspension stirred for 1 hour at room temperature. The crystals were collected by filtration and dried in vacuo to afford 9.79 g (59%) 2-chloro-N-(4-methoxy-7-morpholin-4-yl-benzothiazol-2-yl)-isonicotinamide as a brown crystalline solid. ES-MS m/e (%): 429 (M{37Cl}+Na+, 11), 427 (M{35Cl}+Na+, 30). 407 (M{37Cl}+H+, 30), 405 (M{35Cl}+H+, 100).

Provenance & Evidence