反应详情

A Grignard reagent solution prepared from 0.8 g of magnesium, 10.3 g of (4-bromophenyl) octyl ether and 50 ml of tetrahydrofuran was added dropwise at 0°-5° C. within 30 minutes to a mixture of 7.5 g of crude 2-chloro-5-[(tetrahydro-2-pyranyloxy)methyl]pyridine, 75 ml of tetrahydrofuran and 0.36 g of 1,3-bis(diphenylphosphino)-propanenickel-(II) chloride. The reaction mixture was stirred for 3 hours, left to stand overnight, then adjusted to pH 8 with aqueous sodium hydrogen carbonate solution and diluted with diethyl ether. The organic phase was washed neutral with water, dried over sodium sulfate and concentrated. Chromatographic purification of the residue (14.6 g) on 210 g of silica gel with hexane/ethyl acetate (vol. 4:1) yielded 8.8 g of 2-[4-(octyloxy)-phenyl]-5-[(tetrahydro-2-pyranyloxy)methyl]pyridine.

1. waitleft
2. waitto stand overnight
3. washThe organic phase was washed neutral with water
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated
6. customChromatographic purification of the residue (14.6 g) on 210 g of silica gel with hexane/ethyl acetate (vol. 4:1)