4-Amino-3,5-dimethylisoxazole → HCID 68764632, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 4-[2,4-dichloro-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]butanoate (Reference Example 33; 740 mg, 2.0 mmol), 3,5-dimethylisoxazol-4-amine (672 mg, 6.0 mmol) and p-toluenesulfonic acid monohydrate (380 mg, 2.0 mmol) in 1-methyl-2-pyrrolidinone (3 mL) was stirred at 130° C. for 16 hr. After cooling, the mixture was diluted with ethyl acetate, washed with aqueous sodium bicarbonate and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 20-60% ethyl acetate/n-hexane gradient mixture followed by recrystallization from ethyl acetate/n-hexane to give the title compound (450 mg, 1.0 mmol, 50%) as a colorless solid.

Provenance & Evidence