1-Pentyne → HCID 59657497, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 5.47 g (80.3 mmol) of 1-pentyne in 65 mL THF at −78° C. was added 32.1 ml n-butyl lithium (80.3 mmol; 2.5M in hexanes). After the addition was complete the reaction mixture was warmed to 0° C. and a solution of 8.44 g (44.6 mmol) of 1-benzyl-4-piperidone and 40 mL of THF was added dropwise. The cooling bath was removed and the reaction mixture was stirred at ambient temperature. After 17 h, the reaction was quenched by addition of saturated ammonium chloride and diluted with EtOAc. The aqueous phase was extracted twice with EtOAc. The combined organic phases were washed with brine, dried over sodium sulfate and evaporated to afford a reddish-gold oil. The crude product was purified by flash chromatography on silica gel (EtOAc/hexane 1:1→65:35). The light gold oil was dried over sodium sulfate to afford 8.91 g (78%) of 1-benzyl-4-pentynyl-4-piperidinol: ms (EST) [M+H]+=258.

Provenance & Evidence