Dimethylformamide → N-(3-chloropyridin-4-yl)-N-methyl-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamide

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Reaction Steps

Following Example 17, 4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carbonylchloride and 4-amino-3-chloropyridine were reacted to give N-(3-chloropyridin-4-yl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamide. To a solution of N-(3-chloropyridin-4-yl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamide (0.340 g, 0.953 mmol) in DMF (5 mL, 60 mmol) was added sodium hydride (0.0381 g, 0.953 mmol). The reaction mixture was stirred at room temperature for about 10 min. followed by the addition of methyl iodide (65.25 uL, 1.048 mmol) and stirred at room temperature for another 1 hr. An aliquot was analyzed by LC/MS showing clean conversion to desired product. The reaction mix was diluted with EtOAc and washed with water/saline, dried (Na2SO4) then concentrated to a residue which was analyzed by LC/MS and 1H NMR. The crude product was taken into DMF at about 100 mg/mL, but was not totally soluble. Soluble material was purified by preparative RP-HPLC to give 184 (yield 30% of theoretical). MS: (ESI+) 372.2

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