反应详情

To a solution of (E)-ethyl 6-(tert-butyldimethylsilyloxy)hex-2-enoate (7) (27.2 g, 0.1 mol) in THF and MeOH was added LiOH (6.6 g, 0.3 mol) in 50 mL H2O, the mixture was stirred at RT for 5 hours. After removal of the solvent, the residue was poured into 3N HCl to the pH value was adjusted to 4-5, then extracted with DCM (250 mL×2), and the organic layers were washed with water (250 mL×3) and brine (3×200 mL), dried over Na2SO4 and concentrated to give the desired compound of (E)-6-(tert-butyldimethylsilyloxy)hex-2-enoic acid (8) (12.1 g, 50%) as a yellow oil after purification by column chromatography on silica gel (eluent: PE:EA=5:1). 1H NMR (300 MHz, CDCl3): δ 0.0021 (S, 6H), 0.0857 (S, 9H), 1.600 (m, 2H), 1.197 (t, 3H), 2.240 (q, 2H), 3.586 (t, 2H), 5.832 (d, J=15.6 Hz, 1H), 6.936-6.885 (m, 1H); LC-MS found 245 (M+H)+.

1. customAfter removal of the solvent
2. additionthe residue was poured into 3N HCl to the pH value
3. extractionextracted with DCM (250 mL×2)
4. washthe organic layers were washed with water (250 mL×3) and brine (3×200 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated