反应详情

To a solution of (2R,4R)-1-allyloxycarbonyl-4-t-butyldimethylsilyloxy-2-{2-(5-formylimidazol-1-yl)ethyl}pyrrolidine (12.65 g) in a mixture of tetrahydrofuran (60 ml) and methanol (60 ml) was portionwise added sodium borohydride (1.17 g) with stirring under ice-cooling. The mixture was stirred at the same temperature for 1 hour. The reaction mixture was adjusted to pH 8 with 6N hydrochloric acid at the same condition. The resulting precipitates were filtered off and the filtrate was evaporated in vacuo to give a residue. The residue was chromatographed on silica gel (250 g) eluting with a mixture of chloroform and methanol (9:1, V/V). The fractions containing the desired compound were collected and evaporated in vacuo to give (2R,4R)-1-allyloxycarbonyl-4-t-butyldimethylsilyloxy-2-{2-(5-hydroxymethylimidazol-1-yl)ethyl}pyrrolidine (10.23 g).

1. temperaturecooling
2. stirringThe mixture was stirred at the same temperature for 1 hour
3. customThe resulting precipitates
4. filtrationwere filtered off
5. customthe filtrate was evaporated in vacuo
6. customto give a residue
7. customThe residue was chromatographed on silica gel (250 g)
8. washeluting with a mixture of chloroform and methanol (9:1, V/V)
9. additionThe fractions containing the desired compound
10. customwere collected
11. customevaporated in vacuo