4-Pentylbenzoic acid → (E)-2-[4-pentylbenzoyloxy]-5-[6-[2-methoxy-4-(methoxycarbonylvinyl)phenoxy]oxyhexyl]benzoic acid 11-(2-methylacryloyloxy)undecyl ester

Participants

Reaction Steps

1.43 g (2.09 mmol) (E)-2-hydroxy-5-[6-[2-methoxy-4-(methoxycarbonylvinyl)phenoxy]oxyhexyl]benzoic acid 11-(2-methylacryloyloxy)undecyl ester, 0.42 g (2.20 mmol) 4-pentylbenzoic acid and 64 mg (0.52 mmol) 4-dimethylaminopyridine were dissolved in 30 ml of dichloromethane. A suspension of 0.42 g (2.20 mmol) N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride and 3 ml dichloromethane were added dropwise in the course of 15 minutes. After 20 hour at room temperature the reaction mixture was partitioned between dichloromethane and water; the organic phase was washed repeatedly with water, dried over sodium sulfate, filtered and concentrated by rotary evaporation. Chromatography of the residue on 150 g silica gel using cyclohexane:ethyl acetate 4:1 and subsequent crystallisation form 20 ml isopropyl alcohol yielded 1.40 g (78%) (E)-2-[4-pentylbenzoyloxy]-5-[6-[2-methoxy-4-(methoxycarbonylvinyl)phenoxy]oxyhexyl]benzoic acid 11-(2-methylacryloyloxy)undecyl ester as white crystals.

Provenance & Evidence