反应详情

A solution of 0.473 mL (2.4 mmol) of diisopropylazodicarboxylate in 2 ml of tetrahydrofuran was added dropwise to a mixture of 454 mg (2.0 mmol) of tert-butyl (1S,3S)-3-hydroxycyclohexylcarbamate, 418 mg (2.40 mmol) of 2-bromo-6-hydroxypyridine and 629.5 mg (2.4 mmol) of triphenylphosphine in 5 ml of tetrahydrofuran at 0-5° C. The mixture was stirred for 18 hours. The mixture was concentrated, the residue purified via silica gel chromatography using a gradient of ethyl acetate in heptane to afford 222 mg (30%) of tert-Butyl (1S,3R)-3-(6-bromopyridin-2-yloxy)cyclohexylcarbamate. ESI MS m/z 370.9 (M+1).

1. concentrationThe mixture was concentrated
2. customthe residue purified via silica gel chromatography