Reaktion #87498

Reaktionsgleichung

Ethyl acetate

(1S,2S,3S,4R,5S)-2,3,4-tris-benzyloxy-5-[4-chloro-3-(4-ethoxy-benzyl)-phenyl]-1-fluoromethyl-6,8-dioxa-bicyclo[3.2.1]octane

(1S,2S,3S,4R,5S)-2,3,4-tris-benzyloxy-5-[4-chloro-3-(4-ethoxy-benzyl)-phenyl]-1-chloromethyl-6,8-dioxa-bicyclo[3.2.1]octane

formic acid

→

title compound

(1S,2S,3S,4R,5S)-5-[4-Chloro-3-(4-ethoxy-benzyl)-phenyl]-1-chloromethyl-6,8-dioxa-bicyclo[3.2.1]octane-2,3,4-triol

Lösungsmittel

ethanol

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Filtrationthe mixture was filtered through a short pad of Celite®
2. 2
   Einengenconcentrated in vacuo
3. 3
   SonstigeThe crude material was purified by flash chromatography over silica gel using a 4 g redisep silica cartridge (
4. 4
   Wascheneluting with a gradient of 50 to 100% ethyl acetate in heptane)

Vorschrift

To a suspension of a mixture of (1S,2S,3S,4R,5S)-2,3,4-tris-benzyloxy-5-[4-chloro-3-(4-ethoxy-benzyl)-phenyl]-1-fluoromethyl-6,8-dioxa-bicyclo[3.2.1]octane and (1S,2S,3S,4R,5S)-2,3,4-tris-benzyloxy-5-[4-chloro-3-(4-ethoxy-benzyl)-phenyl]-1-chloromethyl-6,8-dioxa-bicyclo[3.2.1]octane (50 mg, 0.07 mmol) and palladium black (50 mg, 0.38 mmol, Aldrich® high surface area) in ethanol (0.5 mL) and tetrahydrofuran (0.1 mL) was added formic acid (0.10 mL, 2.80 mmol) and the resulting mixture was stirred at room temperature for 1.5 hours. Ethyl acetate was added and the mixture was filtered through a short pad of Celite® and concentrated in vacuo. The crude material was purified by flash chromatography over silica gel using a 4 g redisep silica cartridge (eluting with a gradient of 50 to 100% ethyl acetate in heptane) to afford the title compound as a solid (8.6 mg; ˜80% pure, contaminated with some Example 8). (LCMS) 455.2 (M+H+: positive mode). 1H NMR (400 MHz, METHANOL-d4) delta ppm 7.40 (t, J=1.17 Hz, 1 H), 7.34 (s, 1 H), 7.34 (s, 1 H), 7.05-7.09 (m, 2 H), 6.76-6.80 (m, 2 H), 4.18 (d, J=7.61 Hz, 1 H), 4.01 (s, 2 H), 3.97 (q, J=7.03 Hz, 2 H), 3.90 (d, J=12.30 Hz, 1H), 3.83 (dd, J=8.20, 1.56 Hz, 1 H), 3.72 (d, J=12.30 Hz, 1 H), 3.60-3.65 (m, 2H), 3.50-3.54 (m, 1 H), 1.33 (t, J=7.03 Hz, 3 H).

Quelle