The invention relates to a novel process for the preparation of compounds of formula I ##STR1## wherein R.sub.1 is hydrogen or a suitable amino-protecting group, R.sub.2 is unsubstituted or substituted alkyl, R.sub.3 is hydrogen, aryl, heterocyclyl, unsubstituted or substituted alkyl or unsubstituted or substituted cycloalkyl, R.sub.4, independently of R.sub.1, is hydrogen or a suitable amino-protecting group and m is a number from 1 to 7; and wherein further suitable protecting groups for functional groups may be present; which compounds are antivirally active or can be used as starting materials for pharmaceutically active, especially antiviral compounds. The precursor is an oxo compound, which is in turn prepared by hydrogenation with a suitable complex hydride or with hydrogen in the presence of a suitable catalyst and acyl migration starting from a hydrazone, which is in turn preferably prepared from a nitrile via an imino compound by means of hydrogenation and reaction with a hydrazine derivative, which is prepared from an aldehyde by reaction with a reactive derivative of a carboxylic acid in the presence of a cyanide salt; and the novel intermediates required therefor.
这项发明涉及一种新型制备化合物的方法,其
化学式为I,其中R.sub.1是氢或适当的
氨基保护基,R.sub.2是未取代或取代的烷基,R.sub.3是氢、芳基、杂环烷基、未取代或取代的烷基或未取代或取代的环烷基,R.sub.4独立于R.sub.1,是氢或适当的
氨基保护基,m为1到7的数字;进一步适用于功能基的保护基可能存在;这些化合物具有抗病毒活性,或可用作制药活性的起始物,特别是抗病毒化合物。该前体是一种酮化合物,该酮化合物又通过与适当的复合
氢化物或催化剂存在下的氢化以及从酰
肼起始的酰迁移制备而来,而酰
肼则最好是通过
氰化物盐存在下的醛与
羧酸的反应衍生的重活性衍
生物制备而来,而
羧酸则是通过从腈经由
亚胺化合物的氢化和与联
氨衍
生物反应制备而来;以及所需的新型中间体。