反应详情

To a solution of 1-[(1R,2S,3S,4R,5S)-2,3,4-tribenzyloxy-5-[4-chloro-3-[(4-ethoxyphenyl)methyl]phenyl]-6,8-dioxabicyclo[3.2.1]octan-1-yl]ethyl 2,2-dimethyl propanoate 14a (120 mg, 0.15 mmol) in a methanol/tetrahydrofuran mixture (v/v=4/1, 10 mL) were added o-dichlorobenzene (0.08 mL, 0.72 mmol) and 10% Pd/C (19 mg, 0.02 mmol) in turn at room temperature. The mixture was stirred at room temperature under H2 for 4 hours and filtered. The filtrate was concentrated in vacuo. The residue was purified by silica gel chromatography eluted with PE/EtOAc(v/v)=4/1 to give the title compound 14 as a white solid (62.3 mg, 77.6%, HPLC: 85.3%). The compound was characterized by the following spectroscopic data: MS(ESI, pos. ion) m/z: 580.3[M+HCOO]−; and 1H NMR (600 MHz, DMSO-d6) δ(ppm): 7.42 (m, 2H), 7.32 (m, 1H), 7.08 (m, 2H), 6.82 (m, 2H), 5.38 (brs, 1H), 5.06 (m, 1H), 4.04 (d, 1H), 3.97 (m, 3H), 3.57 (d, 1H), 3.52 (d, 1H), 3.47 (m, 3H), 1.30 (t, 3H), 1.23 (d, 3H), 1.10 (s, 9H).

1. filtrationfiltered
2. concentrationThe filtrate was concentrated in vacuo
3. customThe residue was purified by silica gel chromatography
4. washeluted with PE/EtOAc(v/v)=4/1