HCID 54228599, compound → HCID 54400228, compound

Participants

Reaction Steps

In a mixture of 75 ml of concentrated hydrochloric acid and 180 ml of acetic acid, 9.72 g (26.9 mmol) of 1-(α-cyclopropylcarbonyl-2-fluorobenzyl)-3-ethoxycarbonylmethylidene-4-hydroxypiperidine were dissolved and the resulting solution was allowed to stand at room temperature for 7 days. The reaction mixture was concentrated to dryness under reduced pressure, followed by chromatography on a silica gel column (eluting solvent: chloroform/methanol=100/3~2/1), whereby 5.11 g (yield: 57%) of 1-(α-cyclopropylcarbonyl-2-fluorobenzyl)-3-carboxymethylidene-4-hydroxypiperidine were obtained.

Provenance & Evidence