反应详情

Di-t-butylazodicarboxylate (9.46 g, 41.08 mmol) is added to a stirred solution of triphenylphosphine (10.77 g, 41.08 mmol), 2-(5-methyl-2-phenyl-oxazol-4-yl)-ethanol (7.35 g, 36.15 mmol) and methyl 4-hydroxybenzoate (5.0 g, 32.86 mmol) in toluene (120 mL) at 0° C. After stirring for 15 min, the ice-water bath is removed. Stirring is continued for 1 h at RT, 1 h at 40° C., and overnight at RT. The reaction is then concentrated under vacuum, and the residue is crystallized from EtOAc to give 5-methyl-2-phenyl-4-(2-p-tolyloxy-ethyl)-oxazole as a white solid.

1. customthe ice-water bath is removed
2. stirringStirring
3. waitis continued for 1 h at RT, 1 h at 40° C.
4. customovernight
5. customat RT
6. concentrationThe reaction is then concentrated under vacuum
7. customthe residue is crystallized from EtOAc