Lithium Hydroxide → HCID 66868768, compound

Participants

Reaction Steps

To a solution of 3-tert-butyldimethylsilyloxymethyl-9-ethylcarboxy-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine (0.100 g, 0.238 mmol) in tetrahydrofuran (0.715 mL, 8.82 mmol) and water (0.715 mL, 39.7 mmol) was added 1.00 M of lithium hydroxide in water (0.715 mL). The reaction mixture was stirred at room temperature overnight. The reaction mixture was concentrated and the residue was acidified with 1M HCl then extracted with EtOAc (3×). The combined organics were dried (Na2SO4), filtered and concentrated to give 3-tert-butyldimethylsilyloxymethyl-9-carboxy-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine to which was added 5 ml DCM, triethylamine (0.166 mL, 1.19 mmol) and acetic anhydride (0.112 mL, 1.19 mmol). The reaction was stirred at room temperature 1 h. The reaction was quenched with NaHCO3 washed with EtOAc. The organic layer was acidified 1M HCl extracted EtOAc (3×). The combined organics were dried (Na2SO4), filtered and concentrated to give 3-acetoxymethyl-9-carboxy-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine which was dissolved in ml DCM. A solution of 2.0 M oxalyl chloride in methylene chloride (DCM, 0.357 mL) and 1 drop of DMF was added. The reaction was stirred at room temperature 2 h. The reaction was concentrated to give 3-acetoxymethyl-9-chlorocarbonyl-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine which was dissolved in 5 ml acetonitrile. 3-Chloro-N,N-dimethyl-4-(methylamino)benzamide (0.101 g, 0.477 mmol;) and sodium bicarbonate (0.040 g, 0.47 mmol) were added. The reaction was stirred at room temperature overnight. The reaction was quenched water, extracted three times with ethyl acetate, and concentrated. The crude product was purified by flash chromatography (50-100% EtOAc/Hex) (product eluted at 100% EtOAc, sm at 75% EtOAc) to give N-(2-chloro-4-(dimethylcarbamoyl)phenyl)-N-methyl-(3-acetoxymethyl-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine)-9-carboxamide (41%). MS: (ESI+) 514.3

Provenance & Evidence