反应详情

温度

90 °C

K2CO3 (254 mg, 1.84 mmol) was added to a stirred solution of 4-hydroxybenzoxazole* (248 mg, 1.84 mmol) in DMF (5 mL) at room temperature. The mixture was heated at 90° C. for 15 min and ethylene carbonate (176 mg, 2.00 mmol) was added. The mixture was stirred at 150° C. for 2 h and allowed to attain room temperature. The mixture was diluted with water (2 mL) and MeOH (2 mL), and concentrated. The residue was partitioned between water and CH2Cl2. The aqueous layer was separated and extracted with CH2Cl2 (2×10 mL). The organic phases were pooled and washed with water and brine, and dried over MgSO4. The filtrate was concentrated to give the product as a brown oil that slowly solidified: yield 278 mg (84%), mp 47-49° C. Anal (C9H9NO3) C, H, N.

1. customto attain room temperature
2. concentrationconcentrated
3. customThe residue was partitioned between water and CH2Cl2
4. customThe aqueous layer was separated
5. extractionextracted with CH2Cl2 (2×10 mL)
6. washwashed with water and brine
7. dry with materialdried over MgSO4
8. concentrationThe filtrate was concentrated