HCID 19050181, compound → HCID 59382856, compound

Participants

Reaction Steps

A solution of 2.0 mL of 2.0 M n-BuLi (2.0 mL, 4.0 mmol) was added dropwise to a solution of 1-(o-tolyloxy)-2-fluorobenzene (0.7009 g, 3.5 mmol) in THF (15 mL); the internal temperature was maintained below −70° C. during the addition. A pale, yellow slurry resulted. Confirmation of proton abstraction was confirmed by quenching an aliquot on solid 12. A solution of (R)-tert-butyl 3-(N-methoxy-N-methylcarbamoyl)piperidine-1-carboxylate (1.1159 g, 4.1 mmol) in THF (15 mL) was added dropwise. The reaction was permitted to warm to rt and stirred at for 12 h. The reaction was quenched at 0° C. with satd aq NH4Cl and extracted with Et2O. The Et2O extracts were washed with aq NH4Cl and brine and dried over Na2SO4. Removal of the solvent left crude (3R)-1-tert-butoxycarbonyl-3-(2-fluoro-3-(o-tolyloxy)benzoyl)piperidine (1.79 g, ˜80% pure, quantitative) which was used directly without further purification.

Provenance & Evidence