Sodium Hydroxide → 4-(Diphenylmethylene)piperidine

Participants

Reaction Steps

Sodium hydroxide (15.85 g, 396 mmol) in water (30 mL) was added to the carbamate 1-ethoxycarbonyl 4-(diphenylmethylidene)piperidine 19 (11.47 g, 35.7 mmol) dissolved in ethanol (150 mL). The mixture was heated at reflux overnight. The reaction mixture was cooled to room temperature was then partitioned between water (100 mL) and ethyl acetate (150 mL). The mixture was stirred to dissolve the solid and the layers were separated. The organic layer was washed with brine (100 mL) and the separate aqueous layers were extracted with ethyl acetate (100 mL). The combined organic layers were dried with Na2SO4, filtered, and concentrated. The yellow oil was dried by high vacuum to give 6.7 g (75%) of 20 as a yellow-white waxy solid. 1H NMR was used to confirm the structure of the product. (Amine 22 was similarly prepared.)

Provenance & Evidence