2-Bromopropane → 4-(2-Isopropoxy-3-methyl-benzoylamino)-tetrahydro-thiopyran-4-carboxylic acid methyl ester

関与物質

反応手順

To a suspension of 4-(2-hydroxy-3-methyl-benzoylamino)-tetrahydro-thiopyran-4-carboxylic acid methyl ester (27) (98 mg, 0.32 mmol), anhydrous Cs2CO3 (208 mg, 0.64 mmol), and KI (11 mg, 0.06 mmol) in DMF (5 mL) is added 2-bromopropane (150 μL, 1.6 mmol). The resulting reaction suspension is stirred at RT overnight. After the removal of DMF in vacuo, the residue is dissolved in EtOAc (20 mL) and washed with water (1×5 mL) and brine (2×5 mL). The organic layer is dried over anhydrous Na2SO4 and concentrated in vacuo. The residue is purified by flash column chromatography (80 g silica gel, gradient elution: 5-40% EtOAc in heptane) to give a pure product (28) as white solid (92 mg, 81%).

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