반응 #1778

반응 방정식

4-chromanol

diethyl azodicarboxylate

methyl 4-hydroxy-2-methoxybenzoate

triphenylphosphine

→

methyl 4-(4-chromanoyloxy)-2-methoxybenzoate

용매

THF

THF

반응 조건

후처리

1. 1
   여과The reaction was filtered
2. 2
   기타the solvent was removed under reduced pressure
3. 3
   기타The residue was chromatographed on a silica gel column
4. 4
   세척EtOAc and eluted with same
5. 5
   기타the solvent removed under reduced pressure

실험 절차

To a stirred solution of methyl 4-hydroxy-2-methoxybenzoate (364 mg, 2.0 mmol) in dry THF (1.25 mL) was added triphenylphosphine (525 mg, 2.0 mmol) and the solution was cooled to 0° C. A 500 mL volume of 4-chromanol (200 mg, 1.33 mmol) and diethyl azodicarboxylate (315 mL, 2.0 mmol) in THF was added dropwise via syringe over 0.5 h. The reaction was filtered and the solvent was removed under reduced pressure. The residue was chromatographed on a silica gel column packed in 92:8 hexanes:EtOAc and eluted with same. The appropriate fractions were combined and the solvent removed under reduced pressure to afford methyl 4-(4-chromanoyloxy)-2-methoxybenzoate.

출처