| abstract |
(57) [Problem] To provide a simple method capable of economically producing a dihydropyran derivative with high productivity and high yield. SOLUTION: In producing a 5,6-dihydro-2H-pyran derivative represented by the general formula (III) by reacting an aldehyde with a diene compound in the presence of a Lewis acid catalyst, a base is used as a cocatalyst. Used. Embedded image (Wherein, R 1 is H, an alkyl group having 1 to 12 carbon atoms, an aryl group having a total of 6 to 12 carbon atoms which may be substituted with an alkyl group, and R 2 and R 3 are a hydrogen atom, a carbon atom of 1 And 6 to 6). |