Triethylamine → 3-Methyl 1-(4-nitrophenyl) 5-[4-(trifluoromethyl)phenyl]piperidine-1,3-dicarboxylate

Participants

Reaction Conditions

Reaction Steps

20.0 g (69.6 mmol) of methyl 5-[4-(trifluoromethyl)phenyl]piperidine-3-carboxylate (Example 13A) were dissolved in 1.0 l of dichloromethane, and admixed at 0° C. with 14.1 g (139 mmol) of triethylamine Subsequently, 14.0 g (69.6 mmol) of 4-nitrophenyl chlorocarbonate were added dropwise. The reaction mixture was stirred at 0° C. for 2 h and then at RT for 16 h. For workup, the mixture was washed with saturated aqueous sodium hydrogencarbonate solution. The organic phase was dried over magnesium sulphate, filtered and concentrated under reduced pressure. This gave 31.3 g of crude product, which was reacted without any further purification steps.

Provenance & Evidence