反应详情

A 100-L reaction vessel was charged with 50 mM Tris buffer (Tris HCl (77.4 g) and Tris Base (196.7 g) in deionized water (42.3 L)), 12.0 L of subtilisin (PURAFECT® 4000 L, available from Genencor International), acetonitrile (5.7 L), and (±)-5-methoxycarbonyl-6-(3,4-difluorophenyl)-4-methoxymethyl-1,2,3,6-tetrahydro-2-oxopyrimidine, (2), (120 g, 0.38 mol) and the mixture was allowed to react at 37° C., pH 8.3 for 9 days. The reaction mixture was extracted with toluene (10 L). The aqueous layer was separated and washed with toluene (5 L). The combined organic extracts were washed with brine (10 L). The organic layer was concentrated by rotary evaporation, filtered, then adjusted to 400 mL volume with toluene. The (+)-2 was crystallized by adding heptane (80 mL), followed by seeding. The mixture was stirred for 1 hr, then heptane (520 mL) was added over 8 hrs. The crystals were filtered, washed with 3:2 heptane-toluene (150 mL), then dried under high vacuum to yield (+)-(6S)-5-methoxycarbonyl-6-(3,4-difluorophenyl)-4-methoxymethyl-1,2,3,6-tetrahydro-2-oxopyrimidine, ((+)-2) as a white solid.

1. customto react at 37° C.
2. extractionThe reaction mixture was extracted with toluene (10 L)
3. customThe aqueous layer was separated
4. washwashed with toluene (5 L)
5. washThe combined organic extracts were washed with brine (10 L)
6. concentrationThe organic layer was concentrated by rotary evaporation
7. filtrationfiltered
8. customThe (+)-2 was crystallized
9. additionby adding heptane (80 mL)
10. additionheptane (520 mL) was added over 8 hrs
11. filtrationThe crystals were filtered
12. washwashed with 3:2 heptane-toluene (150 mL)
13. customdried under high vacuum