作者:Senthil K. Perumal、R. F. Pratt
DOI:10.1021/jo060364v
日期:2006.6.1
PhCH2OCONHCH(R)COCR‘N2. The electrophilicity of the carbonyl group in the resulting phosph(on)ates was assessed by the degree of hydration in aqueous solution, determined from NMR spectra. These compounds inhibited typical class C and class D β-lactamases, particularly the latter group, but showed no activity against class A enzymes. To enhance the carbonyl electrophilicity, an α-difluorinated analogue (R =
一系列通式为PhCH 2 OCONHCH(R)COCHR'(CH 2)n(O)P(O 2 -)(O)R''(R = H,CH 3 ; R'= H,CH 3;n= 0,1; R′′= H,CH 3,Et,Ph)已经被制备作为β-内酰胺酶抑制剂的潜在来源。膦酸酯(n = 0)是通过Arbuzov反应获得的,而大多数磷酸盐则是通过磷酸(或/ on)酸与适当的重氮酮PhCH 2 OCONHCH(R)COCR'N 2的反应获得的。。通过由NMR光谱确定的水溶液中的水合度来评估所得的膦酸酯中羰基的亲电子性。这些化合物抑制典型的C类和D类β-内酰胺酶,特别是后者,但对A类酶没有活性。为了增强羰基亲电性,还制备了α-二氟类似物(R = H,CHR'= CF 2,n = 0,R''= Et),但是没有观察到增强的抑制活性。所有证据表明,这些化合物以羰基形式抑制,而不是通过在β-内酰胺酶活性位点形成四面体加合