Tetrahydrofuran → 3-(3,3-Diphenyl-1-butynyl)quinuclidin-3-ol

Participants

Reaction Steps

(1-methyl-1-phenyl-2-propynyl)benzene (Dehmlow E., Tetrahedron Lett. (1971), 563-566) (380 mg, 1.84 mmol.) in THF (10 ml) at −78° C. was treated with a 1.6 N solution of BuLi in hexane (1.21 ml, 1.94 mmol). After 30 minutes, at the same temperature, a solution of quinuclidinone (300 mg, 2.4 mmol) in THF (5 ml) was added dropwise. After 1 hour, the reaction was left at room temperature for 12 hours. The mixture was then diluted with ether and washed with water (twice) and brine. The organic phase was dried over MgSO4 and evaporated to dryness. Chromatography on silica gel (elution: CH2Cl2/EtOH/NH4OH 90/10/0.1) gave 3-(3,3-diphenyl-1-butynyl)quinuclidin-3-ol 195 as a white solid (380 mg, 61%). This compound was used as such in the next step.

Provenance & Evidence