反应详情

Following the general procedure for the preparation of aldehydes from alkenes of Description 11, (3S)-2,2-dimethyl-3-(phenylmethoxy)pent-4-enyl (3-chloropropyl]sulfonate (11a) (25.0 g, 69.3 mmol) dissolved in a mixture of 300 mL of dichloromethane (DCM) and 40 mL of ethanol was treated with a mixture of oxygen and ozone (O2/O3). Upon completion of the reaction, 10.6 mL (9.0 g, 138 mmol) of dimethyl sulfide (DMS) was added. After work-up, the crude material was purified by silica gel column chromatography using a mixture of ethyl acetate (EtOAc) and hexane (Hxn) (EtOAc/Hxn=1:6) as eluent to provide 15.0 g (60% yield) of the title compound (11b) as a colorless oil. Rf=0.22 (EtOAc/Hxn=1:6). 1H NMR (400 MHz, CDCl3): δ=1.10 (s, 6H), 2.26-2.33 (m, 2H), 3.23-3.29 (m, 2H), 3.65 (d, J=2.8 Hz, 1H), 3.63-3.68 (m, 2H), 4.03 (d, J=9.6 Hz, 1H), 4.15 (d, J=8.8 Hz, 1H), 4.50 (d, J=11.2 Hz, 1H), 4.68 (d, J=11.2 Hz, 1H), 7.30-7.39 (m, 5H), 9.73 (d, J=2.8 Hz, 1H) ppm. MS (ESI) m/z 385.03 (M+Na)+. The analytical data was consistent with the proposed structure.

1. additionwas added
2. customAfter work-up, the crude material was purified by silica gel column chromatography
3. additiona mixture of ethyl acetate (EtOAc) and hexane (Hxn) (EtOAc/Hxn=1:6) as eluent