反应详情

温度

0 °C

To a 0° C. solution of the above 2-[3-(2,2-dimethylpropanoyl)-6-phenyl-1,3-oxazinan-6-yl]ethanol, dimethyl sulfoxide (10 mL, 141 mmol) and diisopropylethylamine (10.5 mL, 60 mmol) in 60 mL CH2Cl2 was added SO3.pyr (9.0 g, 57 mmol) in one portion. The reaction mixture was stirred at 0° C. for 2 h, quenched with saturated aqueous NaHCO3, extracted with CHCl3, dried (Na2SO4) and chromatographed (2:1 Hex:EtOAc) to provide [3-(2,2-dimethylpropanoyl)-6-phenyl-1,3-oxazinan-6-yl]acetaldehyde (2.84 g, 98%) as an oil. 1H NMR (400 MHz, CDCl3): δ 9.64 (t, 1H, J=2.7 Hz), 7.45-7.41 (m, 4H), 7.33 (m, 1H), 5.49 (dd, 1H, J=11.1, 1.9 Hz), 4.74 (d, 1H, J=11.5 Hz), 4.27 (m, 1H), 3.08 (m, 1H), 2.72 (ABqd, 2H, J=15.3, 2.8 Hz), 2.43 (ddd, 1H, J=14.2, 4.1, 3.0 Hz), 2.11 (ddd, 1H, J=14.2; 11.4, 4.3 Hz), 1.28 (s, 9H). ESI-MS 312 (M+Na).

1. customquenched with saturated aqueous NaHCO3
2. extractionextracted with CHCl3
3. dry with materialdried (Na2SO4)
4. customchromatographed (2:1 Hex:EtOAc)