Structure–activity relationships of the peptide deformylase inhibitor BB-3497: modification of the methylene spacer and the P1′ side chain
摘要:
Structural modifications to the peptide deformylase inhibitor BB-3497 are described. In this paper, we describe the initial SAR around this lead for modifications to the methylene spacer and the P1' side chain. Enzyme inhibition and antibacterial activity data revealed that the optimum distance between the N-formyl hydroxylamine metal binding group and the P1' side chain is one unsubstituted methylene unit. Additionally, lipophilic P1' side chains that closely mimic the methionine residue in the substrate provided compounds with the best microbiological profile. (C) 2003 Elsevier Ltd. All rights reserved.
Structure–activity relationships of the peptide deformylase inhibitor BB-3497: modification of the methylene spacer and the P1′ side chain
摘要:
Structural modifications to the peptide deformylase inhibitor BB-3497 are described. In this paper, we describe the initial SAR around this lead for modifications to the methylene spacer and the P1' side chain. Enzyme inhibition and antibacterial activity data revealed that the optimum distance between the N-formyl hydroxylamine metal binding group and the P1' side chain is one unsubstituted methylene unit. Additionally, lipophilic P1' side chains that closely mimic the methionine residue in the substrate provided compounds with the best microbiological profile. (C) 2003 Elsevier Ltd. All rights reserved.
Various β-keto esters have been reduced by one of β-keto ester reductases isolated frombakers’ yeast. The corresponding β-hydroxy esters have been obtained in excellent enantiomeric and diastereomeric excesses, respectively. It has also been elucidated that the reductase recognizes the stereochemistry not only at the β-carbon but also at the α-carbon affording one of the four possible diastereoisomers
diastereoselectivity in a bakers’ yeastreduction of various alkyl 2-alkyl-3-oxoalkanoates can be controlled by a thermal treatment of the yeast in the presence of methyl vinyl ketone. Pretreated bakers’ yeast gives the corresponding (2R,3S)-hydroxy esters selectively. Two β-keto ester reductases, named L-enzyme-1 and L-enzyme-2, are actual reductants of intact bakers’ yeastreduction. The thermal stability
be formed in reaction of phenyl di-n-butylthioboronite (II) with methyl vinyl ketone. In order to explore its utilization in organic synthesis, the reactivity of Id and other known vinyloxyboranes was variously examined. Id and Ie gave β-hydroxyketones (IVa–c, Va–d) in fairly good yields when they were allowed to react with carbonyl compounds. The reaction of Ia′ and Ib with nitriles, followed by hydrolysis
发现在苯基二正丁基硫代硼酸盐 (II) 与甲基乙烯基酮反应中形成了一种新的乙烯基氧基硼烷衍生物 Id。为了探索其在有机合成中的应用,对 Id 和其他已知乙烯基氧基硼烷的反应性进行了各种检查。当它们与羰基化合物反应时,Id 和 Ie 以相当好的产率得到 β-羟基酮(IVa-c,Va-d)。Ia'和Ib与腈反应,然后水解,分别得到β-亚氨基硫酸酯(VIa-c)和β-酮酯(VIIa-d)。还发现硼烷(Ib)在室温下与甲酸酯或甲酰胺反应得到α-甲酰基己酸乙酯。
Water/n‐Octanol Partition Coefficients of 1,2‐Dithiole‐3‐thiones
Water/n-octanol partition coefficients (log P) for 33 1,2-dithiole-3-thiones and for 18 1,2-dithiol-3-ones were determined by RP-HPLC measurement of the concentration of the solute in aqueous solution after equilibrium. Depending on the nature of the substituents (alkyl or aryl) and their position(s) (4,5, or both) on the dithiole nucleus, some peculiar behaviors were revealed. Therefore, different