.alpha.-Hydroxy-2-oxo-1-azetidinemethane-carboxylic acid compounds of formula ##STR1## wherein R.sub.1 represents a hydrogen atom or the organic residue of an alcohol, R.sub.2 represents a hydrogen atom or an acyl residue, R.sub.3 represents an organic residue and R.sub.4 represents a hydrogen atom, when R.sub.2 stands for an acyl residue, or the two groups R.sub.3 and R.sub.4 together represent a disubstituted carbon atom, when R.sub.2 stands for a hydrogen atom or an acyl group, are useful as intermediates for the manufacture of pharmacologically active compounds.
.alpha.-羟基-2-氧代-1-氮杂环
甲烷羧酸化合物,其
化学式为##STR1##其中R.sub.1代表氢原子或醇的有机残基,R.sub.2代表氢原子或酰基残基,R.sub.3代表有机残基,R.sub.4代表氢原子(当R.sub.2代表酰基残基时),或R.sub.3和R.sub.4两个基团一起代表一个二取代的碳原子(当R.sub.2代表氢原子或酰基时),这些化合物用作制造药理活性化合物的中间体。