反应详情

A solution of methyl (2E)-3-(2-amino-4-methoxyphenyl)acrylate (Intermediate 4, 500 mg, 2.4 mmol) in acetonitrile (600 mL) was deoxygenated under vacuum, purged with nitrogen and irradiated at 365 nm with a long wave UV lamp (B-100AP, Blak Ray) for 28 hours. The solvent was removed under reduced pressure and the product was precipitated from dichloromethane (20 mL) by the addition of hexanes (100 mL) to give 357 mg (76% yield) of the crude product as a colorless solid, 90% pure by 1H-1-NMR (together with 10% dimer), mp 190° C.

1. custompurged with nitrogen
2. customirradiated at 365 nm with a long wave UV lamp (B-100AP, Blak Ray) for 28 hours
3. customThe solvent was removed under reduced pressure
4. customthe product was precipitated from dichloromethane (20 mL) by the addition of hexanes (100 mL)