反应详情

A solution of cycloheptanecarbonitrile (12.3 g), 100 mmol) in THF (50 ml) was added dropwise to a well stirred solution of lithium diisopropylamide (105 mmol) in THF/hexane (75 ml/60 ml) under nitrogen, keeping the temperature at -65°. After 1 h, the solution was allowed to warm to ambient temperature and added dropwise to a well stirred solution of bromochloromethane (32.5 ml; 500 mmol) in THF (50 ml) under nitrogen keeping the temperature between -50° and -60°. After 10 min, the solution was allowed to warm to ambient temperature, poured into water (250 ml) and the aqueous mixture extracted with chloroform (3×150 ml). The extracts were washed with 2N-HCl (2×50 ml), saturated aq. NaHCO3 (100 ml), and water (100 ml), then dried (MgSO4) and evaporated under reduced pressure to give a brown oil (18.0 g). Distillation gave the title compound (12.65 g), b.p. 78°-80° at 0.25 mmHg.

1. customat -65°
2. additionadded dropwise to a well
3. waitAfter 10 min
4. temperatureto warm to ambient temperature
5. extractionthe aqueous mixture extracted with chloroform (3×150 ml)
6. washThe extracts were washed with 2N-HCl (2×50 ml), saturated aq. NaHCO3 (100 ml), and water (100 ml)
7. dry with materialdried (MgSO4)
8. customevaporated under reduced pressure