反应详情

A solution of 11-13 (0.145 g, 0.285 mmol) in 1:1 THF/MeOH (6 mL) was treated with LiOH (0.114 g, 28.5 mmol) dissolved in 6 mL of H2O. After stirring for 1 hour at room temperature the solvents were removed, the residue dissolved in H2O/EtOAc/10% KHSO4 and the layers separted. The water layer was washed with EtOAc, the organic layers were combined, dried, and filtered to give the intermediate acid as a yellow oil. This material was dissolved in EtOAc (10 mL), cooled to -78° C., the solution saturated with HCl gas and warmed to 0° C. for 0.5 hours, then concentrated and dried under vacuum to give 11-14 as fluffy solid.

1. customwere removed
2. dissolutionthe residue dissolved in H2O/EtOAc/10% KHSO4
3. washThe water layer was washed with EtOAc
4. customdried
5. filtrationfiltered
6. customto give the intermediate acid as a yellow oil
7. temperaturecooled to -78° C.
8. concentrationconcentrated
9. customdried under vacuum