tert-Butanol → HCID 178452692, compound

Participants

Reaction Conditions

Reaction Steps

Trans-4-carboxy-3-[4-(2-oxopyrrolidin-1-yl)cyclohexylcarbonylamino]-N-(5-chloropyridin-2-yl)benzofuran-2-carboxamide (325 mg) obtained in Example 422 is dissolved in t-butanol (8 ml), and thereto are added at room temperature triethylamine (91 μl) and diphenylphosphoryl azide (140 μl), and the mixture is stirred at 60° C. for 1.5 hour, and then heated under reflux for 5.5 hours. The reaction solution is diluted with a saturated aqueous sodium hydrogen carbonate solution, and extracted with chloroform. The organic layer is washed with a saturated brine, dried over sodium sulfate, and the solvent is evaporated under reduced pressure. The resulting residue is purified by silica gel column chromatography (eluent: chloroform/methanol=100/1, then 10/1) to give the title compound (141.7 mg).

Provenance & Evidence