Antibiotic compounds derived from cephalosporins, process for their
申请人:Sanofi
公开号:US04656166A1
公开(公告)日:1987-04-07
The compounds according to the invention correspond to the formula: ##STR1## in which: The COOA group at the 4 position is an acid radical, or an alkaline or alkaline-earth salt, or an amino acid or amine salt, for example triethylamine or ethanolamines, or an easily hydrolyzable or metabolically labile and pharmaceutically acceptable ester radical. X denotes an oxygen atom or a sulfur atom n is zero or 1 R.sub.1 and R.sub.2 each denote independently hydrogen or a lower alkyl group, preferably a methyl group, or R.sub.1 and R.sub.2 taken together with the carbon atom to which they are linked form a cyclobutyl or cyclopentyl nucleus. B is the residue of a primary or secondary amine.
Simultaneous assembly of the β-lactam and thiazole moiety by a new multicomponent reaction
作者:Jürgen Kolb、Barbara Beck、Alexander Dömling
DOI:10.1016/s0040-4039(02)01621-0
日期:2002.9
3-dimethylamino-2-isocyanoacylate is described. During the course of this reaction two heterocyclic moieties, a thiazole and a β-lactam ring, are formed simultaneously and under mild conditions. The increase in molecular complexity here is dramatic as 2 CN, 2 CS and 1 CC bonds are formed in a new ‘one-pot’ multicomponent reaction.