申请人:University of Notre Dame du Lac
公开号:US04992544A1
公开(公告)日:1991-02-12
Monocyclic .beta.-lactam compounds represented by the formula ##STR1## wherein R.sub.1 is H, NH.sub.2, acylamino, C.sub.1 -C.sub.4 alkyl, etc.; R.sub.2 is e.g. C.sub.1 -C.sub.4 alkyl, hydroxyalkyl, aminoalkyl, carboxy, esterified carboxy, esterified carboxyalkyl, or carboxyalkyl; and R.sub.3 is hydrogen, benzyl, substituted benzyl, pivaloyl, --SO.sub.3 M, or --P(C.dbd.O)(OM')2; are obtained by the cyclization of an O-substituted hydroxamate of a .beta.-substituted alkylcarboxylic acid. For example, .alpha.-ethylmalic acid monobenzyl ester is reacted with O-benzylhydroxylamine to form the O-benzylhydroxamate of the free carboxy group, and the hydroxamate is cyclized with diethyl diazodicarboxylate and triphenylphosphine to form the .beta.-lactam of the above formula wherein R.sub.1 is ethyl, R.sub.2 is benzyloxycarbonyl and R.sub.3 is benzyl. The .beta.-lactam compounds are useful intermediates for preparing .beta.-lactamase inhibitors and monocyclic .beta.-lactam antibiotics and, when R.sub.3 is --SO.sub.3 M or --P(C.dbd.O)(OM')2 the compounds and salts thereof are antibacterial agents.
单环β-内酰胺化合物的化学式为##STR1##其中R.sub.1为H,NH.sub.2,酰基氨基,C.sub.1-C.sub.4烷基等;R.sub.2为例如C.sub.1-C.sub.4烷基,羟基烷基,氨基烷基,羧基,酯化羧基,酯化羧基烷基或羧基烷基;R.sub.3为氢,苄基,取代苄基,对叔丁基羰基,--SO.sub.3 M或--P(C.dbd.O)(OM')2。通过将β-取代烷基羧酸的O-取代羟肟酸环化可获得这些化合物。例如,α-乙基苹果酸单苄基酯与O-苄基羟肟酸反应形成自由羧基的O-苄基羟肟酸,并且该羟肟酸与双乙基二氮基草酸酯和三苯基膦环化形成上述化学式的β-内酰胺,其中R.sub.1为乙基,R.sub.2为苄氧羰基,R.sub.3为苄基。β-内酰胺化合物是制备β-内酰胺酶抑制剂和单环β-内酰胺抗生素的有用中间体,并且当R.sub.3为--SO.sub.3 M或--P(C.dbd.O)(OM')2时,这些化合物及其盐是抗菌剂。