(3-Amino-2-oxoalkyl)phosphonic acids and their analogs as novel inhibitors of D-alanine:D-alanine ligase
作者:Prasun K. Chakravarty、William J. Greenlee、William H. Parsons、Arthur A. Patchett、Patricia Combs、Alan Roth、Robert D. Busch、Theodore N. Mellin
DOI:10.1021/jm00128a033
日期:1989.8
The dipeptide D-alanyl-D-alanine is an essential precursor of bacterial peptidoglycan; thus, blocking its formation is a possible target for the design of novel antibacterial agents. The synthesis of this dipeptide by bacterial D-alanine:D-alanineligase requires ATP. In analogy with glutamine synthetase, we hypothesized a mechanism for this enzyme involving the intermediacy of D-alanyl phosphate.
The synthesis of the cytotoxic marine natural product amaminol B is described. Key steps include an organocatalytic intramolecular Diels-Alder reaction, an HWE olefination and a diastereoselective ketone reduction.
本文介绍了具有细胞毒性的海洋天然产物氨基醇 B 的合成过程。关键步骤包括有机催化分子内 Diels-Alder 反应、HWE 烯化反应和非对映选择性酮还原反应。
Zinc-Mediated Chain Extension of β-Keto Phosphonates
作者:Christopher A. Verbicky、Charles K. Zercher
DOI:10.1021/jo000343f
日期:2000.9.1
A variety of beta-keto phosphonates can be converted to gamma-keto phosphonates through reaction with ethyl(iodomethyl)zinc. The presence of alpha-alkyl substituents, Lewis basic functionality, and modestly acidic NH-protons are accommodated in substrates of this reaction. Chain extension of beta-keto phosphonates that contained olefinic functionality proceeded more quickly than cyclopropanation; however, it was not possible to effect the chain extension to the exclusion of cyclopropane formation. A primary reason for this imperfect chemoselectivity appears to be the slow chain extension of beta-keto phosphonates. Nevertheless, the simplicity, the scope, and efficiency of this method serve to make it an attractive alternative to the established methods for gamma-keto phosphonate formation.