N-Sulfonyloxy-β-lactam Inhibitors for β-Lactamases
摘要:
Structure-function analysis with a series of N-sulfonyloxy beta-lactam molecules as inhibitors of beta-lactamases is reported. The best of these compounds acylate the active site of the class A TEM-1 beta-lactamase from Escherichia coli rapidly, and resist deacylation. Whereas acylation of the active site of the class C beta-lactamase from Enterobacter cloacae was not seen, these compounds function as competitive inhibitors of this enzyme. (C) 2000 Elsevier Science Ltd. All rights reserved.
N-Sulfonyloxy-β-lactam Inhibitors for β-Lactamases
摘要:
Structure-function analysis with a series of N-sulfonyloxy beta-lactam molecules as inhibitors of beta-lactamases is reported. The best of these compounds acylate the active site of the class A TEM-1 beta-lactamase from Escherichia coli rapidly, and resist deacylation. Whereas acylation of the active site of the class C beta-lactamase from Enterobacter cloacae was not seen, these compounds function as competitive inhibitors of this enzyme. (C) 2000 Elsevier Science Ltd. All rights reserved.
The present invention provides processes for the production of docetaxel. Docetaxel is produced by protecting the C(7) and the C(10) hydroxy groups of 10-DAB with a bridging silicon-based protecting group. The resulting 7,10-protected 10-DAB derivative is then derivatized and deprotected to form docetaxel.
The present invention provides processes for the production of paclitaxel. Paclitaxel is produced by protecting the C(7) and the C(10) hydroxy groups of 10-DAB with a bridging silicon-based protecting group. The resulting 7,10-protected 10-DAB derivative is then derivatized and deprotected to form paclitaxel.
Potent mechanism-based inhibition of the TEM-1 .beta.-lactamase by novel N-sulfonyloxy .beta.-lactams
作者:Alexey Bulychev、Michael E. O'Brien、Irina Massova、Min Teng、Tracy A. Gibson、Marvin J. Miller、Shahriar Mobashery
DOI:10.1021/ja00127a005
日期:1995.6
A novel class of N-sulfonyloxy beta-lactam molecules are described as potent mechanism-based inactivators for the bacterial TEM-1 beta-lactamase, a prototypic class A enzyme. These molecules inactivate the enzyme with k(inact)/K-i values in the range of 1-7 x 10(4) M(-1) s(-1) and partition ratios (i.e., k(cat)/k(inact)) of 2-7. The mechanism of action of these inactivators was investigated. These molecules acylate the active-site serine of the TEM-1 beta-lactamase, a process that results in the release of the sulfonate attached to the lactam nitrogen, giving rise to a proposed beta-amino cinnamoyl derivative as the inhibitory species. This species undergoes gradual hydrolysis with concomitant recovery of activity, the rate constants for which were evaluated.
Mulengi, J. Kajima; Fatmi, N., Bulletin des Societes Chimiques Belges, 1992, vol. 101, # 4, p. 257 - 260
作者:Mulengi, J. Kajima、Fatmi, N.
DOI:——
日期:——
PROCESSES FOR THE PREPARATION OF DOCETAXEL
申请人:Florida State University Research Foundation, Inc.