Triethylamine → 2-{6-[(tert-butyloxycarbonylamino)acetylamino]benzothiazol-2(3H)-ylidene}-2-(4-trifluoromethylpyrimidin-2-yl)acetamide

Participants

Reaction Steps

Compound 76A was prepared from compound 32A as follows. To a solution of N-(tert-butoxycarbonyl)glycine hydrochloride (20 mg) in DMF (5 mL) were added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (190 mg), triethylamine (388 μL, 3.88 mmol), and 2-[6-aminobenzothiazol-2(3H)-ylidene]-2-(4-trifluoromethylpyrimidin-2-yl)acetamide (141 mg). The mixture was stirred at room temperature for 1 hr, then poured into EA (50 mL). The EA layer was washed three times with 10% aqueous sodium bicarbonate (30 mL each), and three times with water (15 mL each), then dried over magnesium sulfate, filtered, and concentrated under reduced pressure to give 2-{6-[(tert-butyloxycarbonylamino)acetylamino]benzothiazol-2(3H)-ylidene}-2-(4-trifluoromethylpyrimidin-2-yl)acetamide as a brown foam. 2-{6-[(Tert-butyloxycarbonylamino)-acetylamino]benzothiazol-2(3H)-ylidene}-2-(4-trifluoromethylpyrimidin-2-yl)acetamide (80 mg, 156 mmol) was dissolved in 4N hydrogen chloride in dioxane (5.0 mL, 20 mmol), and the mixture stirred at room temperature for 2 hr. The mixture was concentrated to give 2-{6-[(2-aminoacetyl)-amino]benzothiazol-2(3H)-ylidene}-2-(4-trifluoromethylpyrimidin-2-yl)acetamide (50 mg) as a beige solid. Other compounds with an amide side-chain may be similarly prepared from compound 32A.

Provenance & Evidence