methyl 2,3-dihydro-2,2-dimethyl-7-methoxybenzofuran-4-carboxylate 在
乙醇 、 水 作用下,
以
乙醇 、 sodium hydroxide 为溶剂,
反应 2.0h,
以4.7 g of the title compound of m.p. 147-149° C. are obtained的产率得到2,3-dihydro-2,2-dimethyl-7-methoxybenzofuran-4-carboxylic acid
(DE) Verbindungen der Formel (I), worin R1, R2, R3 und R4 die in der Beschreibung angegebenen Bedeutungen haben, sind neue wirksame PDE-Hemmstoffe.(EN) The invention concerns compounds of formula (I), in which R1, R2, R3 and R4 have the meanings given in the description. These compounds are novel, effective PDE-inhibitors.(FR) L'invention concerne des composés de formule (I) où R1, R2, R3 et R4 correspondent à la définition donnée dans la description. Ces composés constituent de nouveaux inhibiteurs de la phosphodiestérase efficaces.
The invention concerns componuds of formula (I), in which R1, R2, R3 and R4 have the meanings given in the description. The compounds are novel, effective PDE-inhibitors.