4.4. N -(2-(4-Isopropyl-4,5-dihydrooxazol-2-yl)phenyl)benzam-
ide 4
To the solution of 0.100 g of 3 in dichloromethane (10 mL), N,N -
diisopropylethylamine (0.190 g) was added at 0C and stirred for30 min. Next, benzoyl chloride (0.075 g) was added at the same
temperature. The reaction mixture was then stirred overnight at
room temperature. The reaction was checked by TLC. After comple-
tion, the reaction mixture was washed with water (10 mL 2). The
organic layer was dried over sodium sulfate and evaporated on a
rotary evaporator. The crude product was then purified by column
chromatography on silica gel (60–120 mesh) using ethylacetate
and petroleum ether as eluents. The pure product was isolated as
a white solid. Yield: 82%; ½a
28
D
¼þ82:8(c 1.00, CHCl
3
). [lit.
17