1-Butanol → Ethyl 2-({6-[(2-{4-[(biphenyl-2-ylcarbamoyl)oxy]piperidin-1-yl}ethyl)(methyl)amino]-6-oxohexyl}amino)-1,3-thiazole-5-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

1-Butanol (3.0 mL) was added to the compound (205 mg, 0.380 mmol) obtained in Example 11c, ethyl 2-bromo-1,3-thiazole-5-carboxylate (179 mg, 0.760 mmol) and triethylamine (212 μL, 1.52 mmol), and the mixture was stirred at 160° C. for 23 hours. The mixture was left to stand for cooling, then ethyl acetate was added to dilute the mixture, and the organic layer was washed with a saturated aqueous sodium hydrogencarbonate solution. The organic layer was dried with anhydrous magnesium sulfate, and then solvent was evaporated under reduced pressure. The resulting residue was purified by NH silica gel column chromatography (n-hexane:ethyl acetate, 50:50→0:100, v/v) to give the title compound (186 mg; 79%) as a colorless oily substance.

Provenance & Evidence