Morpholine → HCID 18960596, Verbindung

Reaktionsgleichung

[Br:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=O)=[CH:4][C:3]=1[CH3:11].C(N1C=CN=C1)(N1C=CN=C1)=O.[NH:24]1[CH2:29][CH2:28][O:27][CH2:26][CH2:25]1>C1COCC1>[Br:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([N:24]2[CH2:29][CH2:28][O:27][CH2:26][CH2:25]2)=[O:8])=[CH:4][C:3]=1[CH3:11]

Komponenten

Versuchsvorschrift

A solution of 4-bromo-3-methylbenzoic acid (5.00 g) in dry THF (60 ml) was added dropwise at -5° to +5° to 1,1'-carbonylbis[1H-imidazole](4.90 g) and stirred under nitrogen over 10 min. Stirring was continued at +23° for 4 h, and morpholine (6.1 ml) added dropwise over 1 min. After 16 h the solution was evaporated, treated with aqueous 2M hydrochloric acid (80 ml), and extracted with ethyl acetate (4×75 ml). The combined, dried organic extracts were washed with aqueous saturated sodium bicarbonate (100 ml), dried and evaporated. A solution of the residual oil in dichloromethane (60 ml) was adsorbed onto silica gel (Merck 7734) and the mixture applied as a plug to a flash column of silica gel (Merck 9385). Gradient elution with ethyl acetate:hexane (3:7→6:4) afforded the title compound as a cream solid (5.75 g).