Acetyl chloride → methyl (1S,4R)-4-(5-{3-[(acetyloxy)methyl]-5-nitrophenyl}-1,3-thiazol-2-yl)-4-hydroxy-2,2-dimethylcyclohexanecarboxylate

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Reaction Steps

To a solution of the product of Step 4 (194 mg, 0.46 mmol) dissolved in dichloromethane (1.8 mL) at −20° C. was added acetyl chloride (34 μL, 0.48 mmol) and triethylamine (129 μL, 0.92 mmol). The reaction was warmed to room temperature and stirred for 2.5 h. The reaction was quenched with saturated aqueous sodium bicarbonate, and extracted with dichloromethane (3×). The combined organic layers were washed with brine, then dried over sodium sulfate, filtered, and concentrated to afford methyl(1S,4R)-4-(5-{3-[(acetyloxy)methyl]-5-nitrophenyl}-1,3-thiazol-2-yl)-4-hydroxy-2,2-dimethylcyclohexanecarboxylate (203 mg, 0.39 mmol, 86% yield) as a yellow foam. MS ESI: [M+H]+ m/z 463.1.

Provenance & Evidence