反应详情

A mixture of 0.98 g (10 mmol) of 5-hexyn-1-ol, 1.98 g (11 mmol) of 2-hydroxybenzenepropanoic acid methyl ester, 2.88 g (11 mmol) of triphenylphosphine, 1.91 g (11 mmol) of diethyl azodicarboxylate, and 220 mL of dry tetrahydrofuran was stirred at room temperature for 100 hr and then concentrated under reduced pressure. The residue was triturated with 9:1 hexane-ether. The solid was filtered with suction and washed with the same solvent mixture. The filtrate and washes were combined and concentrated in vacuo. Flash chromatography of the residue on silica gel, eluting with 9:1 hexane-ether gave 2 g (77%) of 2-[(5-hexynyl)oxy]benzenepropanoic acid methyl ester as a colorless oil.

1. concentrationconcentrated under reduced pressure
2. customThe residue was triturated with 9:1 hexane-ether
3. filtrationThe solid was filtered with suction
4. washwashed with the same solvent mixture
5. concentrationconcentrated in vacuo
6. washFlash chromatography of the residue on silica gel, eluting with 9:1 hexane-ether