Dimethylformamide → 2-Ethyl-4-methyl-5-(7-methyl-3,4,6,7-tetrahydropyrano[3,4-d]imidazol-2-yl)benzoic acid

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Reaction Conditions

Reaction Steps

Into around-bottom flask, was placed a solution of 3-bromo-5-methyldihydro-2H-pyran-4(3H)-one (compound 400.2, 800 mg, 4.14 mmol, 1.6 equiv) in N,N-dimethylformamide (5 mL). Ammonium hydroxide (25% NH3 in H2O) (530 mg, 7.8 mmol, 3.0 equiv), NH4OAc (904 mg, 11.7 mmol, 4.50 equiv) and 2-ethyl-5-formyl-4-methylbenzoic acid (compound 211.4, 500 mg, 2.60 mmol, 1.00 equiv) were added to the flask. The resulting mixture was stirred at 130° C. for 2 h, then concentrated in vacuo. The residue was purified by silica gel chromatography with dichloromethane/methanol (70/1) as the eluent to obtain the title compound as a white solid (30.0 mg, 2%).

Provenance & Evidence