Hydrochloric Acid → 3-[3-(1-Benzyloxycarbonyl-1-methyl-ethoxy)-phenyl]-piperidine-1-carboxylic acid 4-isopropyl-benzyl ester

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To a solution of 4-isopropylbenzyl alcohol (0.86 g, 5.75 mmol) in 10 mL toluene was added 1,1′-carbonyldiimidazole (0.87 g, 5.40 mmol). This solution was stirred 18 h at ambient temperature. 2-methyl-2-(3-piperidin-3-yl-phenoxy)-propionic acid benzyl ester (Preparation 2, Method C; 1.27 g, 3.59 mmol) was added in 5 mL toluene and the resultant solution was stirred 18 h at ambient temperature. The reaction was diluted with water (200 mL), acidified with 1N aqueous hydrochloric acid and extracted with diethyl ether (2×150 mL). The organic extracts were combined, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resultant oil was flash chromatographed with 10% ethyl acetate/hexanes to yield 1.07 g (56%) of the desired 3-[3-(1-Benzyloxycarbonyl-1-methyl-ethoxy)-phenyl]-piperidine-1-carboxylic acid 4-isopropyl-benzyl ester as a clear oil.

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