申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0526231A1
公开(公告)日:1993-02-03
Coumarin and a derivative (2):
(R₁ to R₄ = H, Me or Et, at least two of R₁ to R₄ being H), are produced by heating a 3-(2-cyclohexanoyl)propionic acid ester (1):
(R₅ = C₁₋₄ alkyl) with a palladium catalyst to cause cyclization and dehydrogenation reactions.
After about 80% conversion of the ester (1) the reaction temperature is increased, typically by 20 - 40°C.
香豆素及其衍生物 (2):
(R₁至 R₄ = H、Me 或 Et,R₁至 R₄ 中至少有两个为 H),是通过加热 3-(2-环己酰基)丙酸酯 (1) 制得的:
(R₅=C₁₋₄烷基)与钯催化剂发生环化和脱氢反应。
当酯 (1) 的转化率达到约 80% 后,反应温度升高,通常为 20-40°C 。