Sodium Iodide → (1R,2R,4S)-4-(tert-Butyl-dimethyl-silanyloxy)-2-[4-(4-fluoro-phenyl)-piperidin-1-ylmethyl]-cyclopentanecarboxylic acid ethyl ester

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Reaction Steps

A solution of (1R,2R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-(toluene-4-sulfonyloxymethyl)-cyclopentanecarboxylic acid ethyl ester (example 148, step 1, epimeric mixture, 410 mg), 4-(4-Fluoro-phenyl)-piperidine (cas # 6716-98-9, 291 mg), sodium iodide (1.36 g) and triethylamine (545 mg) in N,N-dimethylformamide (2.8 mL) was stirred at 90° C. over 6 h. The reaction mixture was partitioned between ethyl acetate and an aqueous saturated solution of sodium hydrogenocarbonate. The aqueous layer was extracted with ethyl acetate and the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash chromatography on silica gel with a gradient of cyclohexane/ethyl acetate (9:1 to 1:1 v/v) as eluant to afford the title compound (170 mg, 41%) as a yellow liquid. MS (EI): 464.4 (M+H)+.

Provenance & Evidence