反应详情

To a solution of the TBDPS-protected alcohol 8b (584 mg, 1.10 mmol, crude) in dry THF (9 mL) at 0° C. was added TBAF (1.0M/THF, 1.38 mL, 1.38 mmol), and the reaction mixture was allowed to warm to rt while stirring under argon for 3.5 h, then quenched with sat. aq. NH4Cl and diluted with EtOAc. The aqueous phase was separated and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. Flash chromatography (SiO2, 5:5, hexanes/EtOAc) afforded 194 mg (60%, 2 steps) of the title compound as a colorless oil. [α]D23 −6.4 (c 1.0, DCM); 1H NMR (300 MHz, CDCl3) δ 7.20-7.40 (m, 5 H), 5.65-5.49 (m, 1 H), 5.44 (dd, 1 H, J=15.3, 6.6 Hz), 5.09 (s, 2 H), 4.67 (bs, 1 H), 4.16 (m, 1 H), 3.63 (bs, 2 H), 2.28 (q, 2 H, J=6.0 Hz), 1.82 (bs, 1 H), 1.65 (m, 1 H), 1.40-1.25 (m, 2 H), 0.80-1.00 (m, 6 H); HRMS (ESI) m/z calcd for C17H25NO3Na 314.1732, found 314.1739.

1. customquenched with sat. aq. NH4Cl
2. additiondiluted with EtOAc
3. customThe aqueous phase was separated
4. extractionextracted with EtOAc
5. washThe combined organic layers were washed with brine
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo