反应详情

A mixture of Intermediate 95a (0.50 g, 2.2 mmol) in dry THF (17 mL) was treated with triphenylphosphine (1.13 g, 4.32 mmol) and (R)-(−)-1-benzyloxy-2-propanol (0.52 mL, 3.24 mmol) then diisopropylazodicarboxylate (0.85 mL, 4.32 mmol) was added dropwise (the reaction mixture became very warm). After stirring at ambient temperature for 1.75 h the mixture was treated with water (0.2 mL) then concentrated in vacuo to a viscous orange oil. The oil was purified by FCC, using 0-7% EtOAc in DCM. The resulting oil was purified further by FCC, using 0-30% EtOAc in cyclohexane. The product was applied to a pre-conditioned (with MeOH)SCX-2 cartridge and eluted with MeOH then 2N NH3 in MeOH. The product containing fractions were combined and concentrated in vacuo to give the title compound as a viscous golden oil (0.39 g, 48%). LCMS (Method 3): Rt 3.77 min, m/z 380.4 [MH+].

1. temperaturebecame very warm)
2. concentrationthen concentrated in vacuo to a viscous orange oil
3. customThe oil was purified by FCC
4. customThe resulting oil was purified further by FCC
5. washeluted with MeOH
6. additionThe product containing fractions
7. concentrationconcentrated in vacuo