Pyridine → HCID 19363503, compound

Participants

Reaction Conditions

Reaction Steps

2-(2-Methoxy-5-methylphenyl)octanal (63.8 g, 0.257 mol), methyl iodide (160 ml, 2.57 mol) and benzene (300 ml) were mixed, and this solution was cooled to -5° C. Potassium t-butoxide (31.3 g, 0.279 mol) was added in such a manner that the temperature of the reaction mixture does not exceed 0° C., and the mixture was stirred at -2° C. for 0.5 hour. The reaction mixture was poured into ice water (200 ml) to stop the reaction. The aqueous layer was erected twice with ether (150 ml), and the organic layers were combined, washed with saturated brine (100 ml) and dried over anhydrous magnesium sulfate. The drying agent was filtered off, and the filtrate was concentrated under reduced pressure. Methanol (400 ml), an aqueous solution (110 ml) of semicarbazide hydrochloride (28.6 g, 0.257 mol) and pyridine (20.4 ml, 0.257 mol) were added to the obtained residue, and the mixture was stirred at room temperature for 0.75 hour. The precipitated crystals were collected by filtration, and washed with hexane. The crystals were dried to give 2-(2-methoxy-5-methylphenyl)octanal semicarbazide (64.7 g, 79%) as colorless crystals.

Provenance & Evidence