反应详情

A mixture of methyl 4-benzyloxy-2-hydroxy-5-isopropylbenzoate (900 mg, 3.0 mmol) and anhydrous potassium carbonate (994 mg, 7.2 mmol) in acetonitrile (20 ml) was treated with chloromethyl methyl ether (0.24 ml, 6.6 mmol) and the mixture was stirred and held at 50° C. for 24 hours whereupon further anhydrous potassium carbonate (994 mg, 7.2 mmol) and chloromethyl methyl ether (0.96 ml, 26.4 mmol) were added and the mixture was stirred and held at 50° C. for a further 4 days. Upon cooling to room temperature the solvent was removed in vacuo and the residue treated with water (30 ml). The organic material was extracted with dichloromethane (2×20 ml) and the combined organic extracts were evaporated in vacuo to afford crude methyl 4-benzyloxy-5-isopropyl-2-(methoxymethyloxy)benzoate as a pale yellow oil that was used in the next step without further purification. 1H NMR (DMSO-d6) 7.57 (1H, s), 7.48 (2H, d), 7.44 (2H, t), 7.38 (1H, t), 6.90 (1H, s), 5.23 (4H, s), 3.78 (3H, s), 3.39 (3H, s), 3.21 (1H, m), 1.17 (6H, d). MS: [M+Na]+ 367.

1. additionwere added
2. stirringthe mixture was stirred
3. customwas removed in vacuo
4. additionthe residue treated with water (30 ml)
5. extractionThe organic material was extracted with dichloromethane (2×20 ml)
6. customthe combined organic extracts were evaporated in vacuo