Dimethylformamide → 1-Methylcyclohex-3-ene-1-carboximidic acid

Beteiligte Stoffe

Reaktionsschritte

To a solution of 1-methylcyclohex-3-ene-1-carboxylic acid, 52a, (54.0 g, 385.2 mmol) dissolved in CH2Cl2 (200 mL) was added thionyl chloride (56.2 mL, 770.4 mmol) and 1 mL of DMF. The reaction was warmed to reflux for 3 hrs, then cooled and concentrated in vacuo. The residue was redissolved in 200 mL of CH2Cl2. To the reaction was added ammonium hydroxide (148.2 mL of 13 M solution, 1.9 mol) slowly. The reaction was stirred overnight. The reaction was extracted into CH2Cl2 and water. The organic phase was concentrated in vacuo and purified via flash silica gel chromatography (EtOAc), yielding 25 g of 1-methylcyclohex-3-ene-1-carboxamide.

Herkunft & Nachweise