Triethylamine → HCID 21881058, compound

Participants

Reaction Steps

A solution of PMB-CB-OH (1.154 g, 2.881 mmol), 15-maleinimido-4,7,10,13-tetroxapentadecanoic acid (1.49 g, 4.32 mmol) and triethylamine (1.20 ml, 8.64 mmol) in 20 ml anhydrous dichloromethane is admixed with 2-chloro-1-methylpyridinium iodide (1.10 g, 4.32 mmol) and stirred for three hours at room temperature. It is diluted with 80 ml dichloromethane, washed each time twice with 50 ml 1 n hydrochloric acid, 50 ml water and once with 50 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, ethyl acetate). 1.93 g PMB-CB-4-Mal (92% of theory) is obtained as a colourless oil.

Provenance & Evidence