反应详情

To a stirred, cooled (0° C.) mixture of 2-amino-2-phenyl-propan-1-ol (266 mg) and K2CO3 (292 mg) in THF (5 ml) under an argon atmosphere was added a solution of cyanogen bromide (292 mg) in THF (5 ml). The ice bath was removed and stirring at r.t. was continued for 18 h. The mixture (white suspension) was taken up in EtOAc/H2O 1:1. The aqueous phase was back extracted with EtOAc. The combined organics were washed with brine, dried over MgSO4, filtered and concentrated. The crude product was purified by column chromatography (silica gel; gradient: CH2Cl2->CH2Cl2/MeOH 9:1) to give 4-methyl-4-phenyl-4,5-dihydro-oxazol-2-ylamine (204 mg) as white solid. MS (ISP): 177.1 ([M+H]+)

1. temperatureTo a stirred, cooled
2. customThe ice bath was removed
3. extractionThe aqueous phase was back extracted with EtOAc
4. washThe combined organics were washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe crude product was purified by column chromatography (silica gel; gradient: CH2Cl2->CH2Cl2/MeOH 9:1)