反应详情

3-cyano-N-(2-hydroxyethyl)-4-isopropoxybenzamide was dissolved in DCM (30 mL) and thionyl chloride (1.43 g, 12 mmol) was added at 0° C. The reaction mixture was stirred at room temperature for 1 h and then quenched at 0° C. with water (200 μL) and 6N NaOH solution (1 mL). The mixture was stirred for 30 min. The aqueous layers were extracted with DCM and the combined organic extracts were washed with brine and dried over MgSO4 to afford 570 mg (61% for two steps) of 5-(4,5-dihydrooxazol-2-yl)-2-isopropoxybenzonitrile INT-31. LCMS-ESI (m/z) calculated for C13H14N2O2: 230.3; found 231.0 [M+H]+, tR=2.50 min. 1H NMR (400 MHz, CDCl3) δ 8.17-7.86 (m, 2H), 6.91 (d, J=8.9 Hz, 1H), 4.65 (dt, J=12.2, 6.1 Hz, 1H), 4.37 (dd, J=14.3, 4.9 Hz, 2H), 3.98 (t, J=9.5 Hz, 2H), 1.36 (t, J=5.5 Hz, 6H).

1. customquenched at 0° C. with water (200 μL) and 6N NaOH solution (1 mL)
2. stirringThe mixture was stirred for 30 min
3. extractionThe aqueous layers were extracted with DCM
4. washthe combined organic extracts were washed with brine
5. dry with materialdried over MgSO4