Triethylamine → Ethyl 3-(4-chlorophenyl)-1,2-oxazole-4-carboxylate

反応式

[OH:1]/[N:2]=[C:3](\Cl)/[C:4]1[CH:9]=[CH:8][C:7]([Cl:10])=[CH:6][CH:5]=1.CN([CH:15]=[CH:16][C:17]([O:19][CH2:20][CH3:21])=[O:18])C.C(N(CC)CC)C>C(OCC)C>[CH2:20]([O:19][C:17]([C:16]1[C:3]([C:4]2[CH:9]=[CH:8][C:7]([Cl:10])=[CH:6][CH:5]=2)=[N:2][O:1][CH:15]=1)=[O:18])[CH3:21]

参加物

実験手順

To a solution of (E)- and/or (Z)—N-hydroxy-4-chloro-benzenecarboximidoyl chloride (58.0 g, 250.3 mmol) in diethylether (1.04 L) was added a solution of ethyl 3-(N,N-dimethylamino)acrylate (90.4 mL, 624 mmol) and triethylamine (50.1 mL, 362 mmol) in diethylether (1.04 L). The resulting mixture was then stirred for 14 h at room temperature and evaporated. Purification by chromatography (SiO2, heptane:ethyl acetate=100:0 to 4:1) afforded the title product (57 g, 91%) which was obtained as a white solid. MS: m/e=252.1 [M+H]+.