Ozone → HCID 86701323、化合物

A mixture of (2S,3S,4S)-3,4-bis(benzyloxy)-2-methyl-3,4-dihydro-2H-pyran (0.621 g, 2.00 mmol) and NaHCO3 (17.0 mg, 0.200 mmol) in MeOH (0.22 ml) and DCM (7 mL) was treated with ozone at −78° C. until the solution became light blue in color. The mixture was purged with nitrogen until colorless, diluted with MeOH (7 mL), and treated with a solution of NaBH4 (0.454 g, 12.0 mmol) and NaOAc (0.335 g, 4.08 mmol) in H2O (7 mL). The mixture was slowly warmed to room temperature and stirred for 12 h. The mixture was diluted with EtOAc and washed with H2O. The organic layer was separated and the aqueous layer was extracted with EtOAc. The combined organic phases were washed with brine, dried over MgSO4, filtered, and the filtrate concentrated. The crude residue was purified by flash chromatography (SiO2, hexanes/EtOAc gradient) to yield the title compound as a colorless oil (0.590 g, 93%): IR (neat) 3389, 2876, 1453, 1064, 733, 696 cm−1; 1H NMR (400 MHz, CDCl3) δ 7.39-7.27 (m, 10H), 4.64 (s, 2H), 4.63 (s, 2H), 4.06-3.97 (m, 1H), 3.92-3.83 (m, 1H), 3.80-3.73 (m, 2H), 3.47 (dd, J=6.2, 4.3 Hz, 1H), 2.92 (d, J=4.9 Hz, 1H), 2.23 (dd, J=6.9, 4.9 Hz, 1H), 1.24 (d, J=6.4 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 137.91, 137.71, 128.69, 128.62, 128.23, 128.19, 128.09, 81.72, 79.53, 73.63, 72.78, 67.66, 61.45, 19.74; ESIMS m/z 339.2 ([M+Na]+).

1. customThe mixture was purged with nitrogen until colorless,
2. additiondiluted with MeOH (7 mL)
3. washwashed with H2O
4. customThe organic layer was separated
5. extractionthe aqueous layer was extracted with EtOAc
6. washThe combined organic phases were washed with brine
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationthe filtrate concentrated
10. customThe crude residue was purified by flash chromatography (SiO2, hexanes/EtOAc gradient)

ORDレコード

ord-6725d45c15384d33b3c2913d39cc4b25

出典データセット

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08785479B2