HCID 67170824, compound → HCID 52916806, compound

Participants

Reaction Steps

(2S,3R)-2-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3-methyl-hex-5-enoic acid methyl ester (2.01 g, 7.00 mmol) is dissolved in a 2:1 mixture of 6 N hydrochloric acid and glacial acetic acid (62.5 mL), and the solution is heated at reflux for 4 h. The solution is cooled to room temperature and concentrated under reduced pressure. The product is taken up in water and the solution is filtered. The filtrate is concentrated under reduced pressure and the residue is dissolved in water, then the solution is applied to a column of Amberlite™ IR 120 cation exchange resin (NH4+ form.). The column is washed with water (2.5 L), then eluted with aqueous ammonia solution (2.5 L). The eluate is boiled until no ammonia can be detected, then concentrated under reduced pressure affording the title compound (0.5 g, 3.50 mmol).

Provenance & Evidence