反应详情

A solution of compound IIIa (27 g, 132.2 mmol) in dry tetrahydrofuran (THF, 100 mL) was added dropwise to a stirred suspension of 95% lithium aluminum hydride (LAH, 5.3 g, 132.5 mmol) in dry THF (250 mL) in 30 min period, so that the temperature did not rise for the suspension to reflux. The reaction mixture was stirred vigorously using a mechanical stirrer for 30 min. The excess LAH was quenched with 10% aqueous HCl solution (15 mL). The insoluble material was filtered off and washed with EtOAc. The solvent was evaporated in vacuo from the combined filtrate and EtOAc washing. The residue, thus obtained, was taken into EtOAc (150 mL). The ethyl acetate layer was washed with brine (2×50 mL) and dried over anhydrous sodium sulfate. The desiccant was filtered off and the filtrate was concentrated in vacuo to obtain a gummy material. To this gummy material was added hexane/acetone (20 mL, 9:1, v/v) and boiled for 2 min on a steam bath. The title compound, IVa, (23.3 g, 111.9 mmol, Y: 84.6%) crystallized out from the mixture upon cooling in an ice bath; mp, 116-117° C.; 1H-NMR (300 MHz, acetone-d6) δ ppm: 1.52 (6H, s, 3,3-Me2), 2.1 (3H, s, 6'-Me), 2.17 (2H, t, J=7.7 Hz, 2-H 2), 2.43 (3H, s, 4'-Me), 3.14 (1H, t, J=5.2 Hz, 1-OH, exchanged with D2O), 3.39-3.45 (2H, m, 1-H2), 6.37 (1H, s, Ar-H), 6.49 (1H, s, Ar-H) 7.98 (1H, s, 2'-OH, exchanged D2O); MS (Isobutane-DCI) m/e: 209 (M+H)+ ; IR (KBr) ν max: 3510, 3230, 1310, 850 cm-1.

1. temperatureto reflux
2. customfor 30 min
3. customThe excess LAH was quenched with 10% aqueous HCl solution (15 mL)
4. filtrationThe insoluble material was filtered off
5. washwashed with EtOAc
6. customThe solvent was evaporated in vacuo from the combined filtrate and EtOAc washing
7. customThe residue, thus obtained
8. washThe ethyl acetate layer was washed with brine (2×50 mL)
9. dry with materialdried over anhydrous sodium sulfate
10. filtrationThe desiccant was filtered off
11. concentrationthe filtrate was concentrated in vacuo
12. customto obtain a gummy material
13. customThe title compound, IVa, (23.3 g, 111.9 mmol, Y: 84.6%) crystallized out from the mixture
14. temperatureupon cooling in an ice bath
15. custommp, 116-117° C.