Methanol → HCID 67384766, compound

Participants

Reaction Steps

To a solution of 4-(4-cyanobenzyl)-piperidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-methyl ester (23.04 mmol; 8.26 g) (prepared as in Example 1, but substituting 4-cyanobenzylbromide for 4-biphenylmethyl bromide), in tetrahydrofuran (50 mL) and methanol (50 mL) was added an aqueous 1M NaOH solution (46.1 mmol; 46.1 mL), and the resulting solution was heated to reflux for 48 hours. The mixture was then evaporated and an aqueous 1N HCl solution (50 mL) was added, resulting in the formation of a precipitate. The solid was separated via filtration and dried under vacuum to yield 4-(4-carbamoylbenzyl)-piperidine-1,4-dicarboxylic acid mono-tert-butyl ester. MS (ESI) m/z 384.89 [M+Na]+.

Provenance & Evidence