Aniline → 1-(Phenylcarbamoyl)cyclopropanecarboxylic acid

Temperatur

0 °C

To a mixture of cyclopropane-1,1-dicarboxylic acid (5.29 g, 40.7 mmol, 1.0 eq.) in anhydrous THF (50 mL) under nitrogen was added dropwise triethylamine (4.12 g, 40.7 mmol, 1.0 eq.) with stirring for 30 minutes at 0° C., followed by the addition of thionyl chloride (4.84 g, 40.7 mmol, 1.0 eq.) with stirring for another 30 minutes at 0° C. To the resulting mixture under nitrogen was added dropwise a solution of phenylamine 9 (4.17 g, 44.8 mmol, 1.1 eq.) in anhydrous THF (25 mL) with stirring for 1.5 hours at 0° C. The reaction mixture was diluted with ethyl acetate and extracted with 2N NaOH (to pH>10). The aqueous phase was titrated with 2N HCl to pH 1-2 and then extracted with ethyl acetate. The organic phase was dried with sodium sulfate and concentrated in vacuo to give 1-phenylcarbamoyl-cyclopropanecarboxylic acid as a white solid (5.08 g, 60.8%). 1H NMR (400 MHz, CDCl3): 10.50 (br s, 1H), 7.56-7.54 (m, 2H), 7.35-7.31 (m, 2H), 7.15-7.10 (m, 1H), 1.94-1.91 (m, 2H), 1.82-1.79 (m, 2H).

1. stirringwith stirring for another 30 minutes at 0° C
2. stirringwith stirring for 1.5 hours at 0° C
3. extractionextracted with 2N NaOH (to pH>10)
4. extractionextracted with ethyl acetate
5. dry with materialThe organic phase was dried with sodium sulfate
6. concentrationconcentrated in vacuo

ORD-Eintrag

ord-90763efcbf6547e3b965c239b14f5b89

Quelldatensatz

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08476298B2