| 摘要 |
PURPOSE:To obtain the titled compound useful as a synthetic intermediate for photosensitive dyestuffs, etc., used for silver salt photography with high operating efficiency in one step, by reacting a readily available alkyl vinyl ether as a starting raw material with a Vilsmeier reagent. CONSTITUTION:A Vilsmeier reagent prepared from a disubstituted formamide and POCl3, etc., and expressed by formula II (R<2> and R<3> are alkyl or aryl; X<-> is anion, e.g. Cl or PO2Cl2) is reacted with an alkyl vinyl ether, readily obtained by dealcoholization of the corresponding acetal and expressed by formula I (R is H, halogen, alkyl, alkoxy, aryl or heterocyclic residue; R<1> is lower alkyl) in the presence of an alkali, e.g. K2CO3, etc., at -20 deg.C- the boiling point of a solvent used and the resultant reaction product is hydrolyzed to afford the aimed compound expressed by formula III. EFFECT:Since the reaction can be readily controlled and can be increased, this method is industrially advantageous.
|
