The present invention relates to stereospecific processes for the preparation of enantiomers of 3-substituted-furo[3,4-c]pyridine of formula I, wherein R.sub.3, R.sub.4 and R.sub.6 stand for various substituents, comprising the steps of: oxidation of a racemic pyridine derivative of formula II, reduction of the resulting ketone with a reducing agent, sterospecific locking or blocking of the OH group of the enantiomer alcohol, opening of the acetonide ring and cyclization of the resulting compound. ##STR1## The present invention also relates to compounds thus obtained and therapeutical compositions thereof.
本发明涉及用于制备3-取代基
呋喃[3,4-c]
吡啶的对映体的立体特异过程,其
化学式为I,其中R.sub.3、R.sub.4和R.sub.6代表不同的取代基,包括以下步骤:氧化具有
化学式II的外消旋
吡啶衍生物,用还原剂还原产生的酮,对对映体醇的-OH基进行立体特异性锁定或阻塞,打开
缩酮环并使产生的化合物环化。本发明还涉及因此获得的化合物以及其治疗组合物。