申请人:University of Notre Dame Du Lac
公开号:US04565654A1
公开(公告)日:1986-01-21
Process for N-acyloxy or sulfooxy 2-azetidinones comprising O-acylation of a .beta.-hydroxy or .beta.-halo hydroxamic acid, and cyclizing the O-acylhydroxamate with TPP-CCl.sub.4 -TEA or with TPP-dialkylazodicarboxylate to the N-acyloxy-2-azetidinone. Solvolysis of the acyl group provides an N-hydroxy-2-azetidinone. E.g., N-Cbz-L-serine is converted to the O-acetyl hydroxamate, cyclized and solvolyzed to N-hydroxy-3-(Cbz-amino)-2-azetidinone. The N-hydroxy-2-azetidinones are useful intermediates to monocyclic .beta.-lactam antibiotics and .beta.-lactamase inhibitors.
N-酰氧基或磺酰氧基2-氮杂丁酮的制备过程包括对β-羟基或β-卤代羟肟酸进行O-酰化,然后使用TPP-CCl.sub.4-TEA或TPP-二烷基偶氮二羧酸酯将O-酰基羟肟酸内酰化成N-酰氧基2-氮杂丁酮。酰基的溶解作用提供了N-羟基2-氮杂丁酮。例如,N-Cbz-L-丝氨酸被转化为O-乙酰羟肟酸,环化并溶解为N-羟基-3-(Cbz-氨基)-2-氮杂丁酮。N-羟基2-氮杂丁酮是单环β-内酰胺类抗生素和β-内酰胺酶抑制剂的有用中间体。