Triethylamine → HCID 21881064, compound

Participants

Reaction Steps

A solution of PMB-CB-OH (1.97 g, 4.91 mmol), 6-maleinimido-4-oxacaproic acid (1.57 g, 7.37 mmol) and triethylamine (2.04 ml, 8.64 mmol) is admixed with 2-chloro-1-methylpyridinium iodide (1.88 g, 7.37 mmol) in 30 ml anhydrous dichloromethane and stirred for three hours at room temperature. It is diluted with 140 ml dichloromethane, washed each time twice with 80 ml in hydrochloric acid, 80 ml water and once each time with 80 ml sodium chloride solution (saturated) and dried over magnesium sulfate. Subsequently the solvent is removed in a vacuum and the residue is purified by column chromatography (silica gel, chloroform/methanol 200:1). 2.89 g PMB-CB-1-Mal (99% of theory) is obtained as a colourless oil.

Provenance & Evidence