2-Methyltetrahydrofuran → tert-Butyl (4-Cyano-2-(methylsulfonyl)phenyl)(2-(3-(difluoromethyl)phenylamino)-5-oxocyclopent-1-enyl)methylcarbamate

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Reaction Steps

Sodium hydride (60% in mineral oil, 106 mg, 2.67 mmol) is added in portions to a mixture of 3-(3-(difluoromethyl)phenylamino)cyclopent-2-enone (intermediate 5, 595 mg, 2.66 mmol) and 2-methyltetrahydrofuran (20 mL). After 2 h tert-butyl (4-cyano-2-(methyl-sulfonyl)phenyl)(phenylsulfonyl)methylcarbamate (intermediate 15, 1.00 g, 2.20 mmol) is added, and the mixture is stirred at room temperature for 2 h. Water is added and the mixture is extracted with 2-methyltetrahydrofuran. The organic layer is dried over Na2SO4 and concentrated under reduced pressure. The residue is purified by reversed phase HPLC (Waters SunFire™-C18, gradient of acetonitrile in water, 0.1% formic acid). Yield: 665 mg; ESI mass spectrum [M+H]+=532; Retention time HPLC: 1.13 min (Z018_S04).

Provenance & Evidence