This invention relates to 1,3-dihydro-6-methyl-7-hydroxy-furo-(3,4-c)-pyridine derivatives of the general formula I ##STR1## wherein each of A.sub.1 and A.sub.2 independently represents various hydrocarbon groups and therapeutically acceptable addition salts thereof; to a process for the preparation of the same comprising oxidizing the secondary alcohol .alpha..sup.4, 3-o-isopropylidene-1-methyl-5-(1-hydroxy-1-A.sub.1)-methyl pyridine by any usual technique, reacting the resultant ketone with a compound of the general formula XA.sub.2 wherein X stands for Br or I in the presence of magnesium in diethyl ether at the boil and treating the resultant tertiary alcohol with an acidic agent to provoke breaking of the isopropylidene ring and 3,4-cyclisation; and to pharmaceutical compositions containing these derivatives useful for example in diuresis.
本发明涉及一般式I的1,3-二氢-6-甲基-7-羟基
呋喃-(3,4-c)-
吡啶衍生物,其中A.sub.1和A.sub.2各自独立地表示各种碳氢基团及其治疗上可接受的加合盐;以及制备该化合物的方法,包括通过常规技术将次级醇α.4,3-o-异丙基-1-甲基-5-(1-羟基-1-A.sub.1)-
甲基吡啶氧化,将得到的酮与一般式XA.sub.2的化合物反应,其中X代表Br或I,在二
乙醚中加入
镁并加热至沸腾,然后用酸性试剂处理得到的
三级醇以引发异丙基亚甲基环的断裂和3,4-环化作用;以及含有这些衍
生物的药物组合物,例如用于利尿。