反应详情

Triethylamine (20 ml, 145 mmoles) was added dropwise to a suspension of (5,6-dimethoxy-3-oxo-1,3-dihydro-isobenzofuran-1-yl)-triphenylphosphonium bromide (78 g, 145 mmoles), obtained as described in example 12, and 4-pyridincarboxaldehyde (13.0 ml, 145 mmoles) in methylene chloride (1 l), at room temperature, under stirring. After 1.5 hours the mixture was filtered and evaporated and the residue was treated with boiling ethanol, cooled and filtered. The mother liquors were chromatographed (eluent: methylene chloride then with 1% methanol) and the residue was brought to dryness and joined to the above filtrate to give 25 g of the title compound.

1. customobtained
2. filtrationAfter 1.5 hours the mixture was filtered
3. customevaporated
4. additionthe residue was treated with boiling ethanol
5. temperaturecooled
6. filtrationfiltered
7. customThe mother liquors were chromatographed (eluent