反应详情

To a solution of (S)-((3R,3aR,6R,6aR)-6-hydroxyhexahydrofuro[3,2-b]furan-3-yl)5,6bis(nitrooxy)hexanoate (0.80 g, 2.18 mmol) and Et3N (0.66 g, 6.54 mmol) in THF (30 mL) was added 4-Nitrophenyl chloroformate (0.44 g, 2.18 mmol) as solid. After stirring at rt over night, the mixture was concentrated. The residue was diluted with EtOAc and washed with NaH2PO4 5%. The organic layer was dried over MgSO4 and concentrated. The residue was purified by flash chromatography (Biotage SP1; column SNAP 50; TLC method: n-hexane/ethyl acetate 1/1; Rf=0.38), affording the title product as a pale yellow oil. 1H-NMR (300 MHz, CDCl3); δ 8.32-8.29 (2H, m), 7.44-7.28 (2H, m), 5.33 (1H, m), 5.21-5.05 (2H, m), 4.89-4.65 (3H, m), 4.50 (1H, m), 4.20-3.95 (4H, m), 3.94-3.85 (1H, m), 2.50 (2H, m), 1.84 (4H, m).

1. concentrationthe mixture was concentrated
2. additionThe residue was diluted with EtOAc
3. washwashed with NaH2PO4 5%
4. dry with materialThe organic layer was dried over MgSO4
5. concentrationconcentrated
6. customThe residue was purified by flash chromatography (Biotage SP1; column SNAP 50; TLC method: n-hexane/ethyl acetate 1/1; Rf=0.38)