反応 #87478

反応方程式

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

溶媒

ethanol

tetrahydrofuran

反応条件

後処理

1. 1
   ろ過the mixture was filtered through a short pad of Celite®
2. 2
   濃縮concentrated in vacuo
3. 3
   その他The crude material was purified by flash chromatography over silica gel using a 4 g redisep silica cartridge (
4. 4
   洗浄eluting with a gradient of 50 to 100% ethyl acetate in heptane)

実験手順

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).

出典