Synthetic Access to 3-Substituted Pyroglutamic Acids from Tetramate Derivatives of Serine, Threonine, <i>allo</i>-Threonine, and Cysteine
作者:Halima Bagum、Kirsten E. Christensen、Miroslav Genov、Alexander Pretsch、Dagmar Pretsch、Mark G. Moloney
DOI:10.1021/acs.joc.9b01432
日期:2019.8.16
A general route which provides direct access to pyroglutamates from tetramates, making use of Suzuki coupling on an enol mesylate, followed by reduction, is reported. This work permits direct scaffold hopping from tetramate to substituted pyroglutamates. Some compounds in the library showed modest antibacterial activity against Gram-positive bacteria.
Stereoselectivity in the Reduction of Bicyclic Tetramates
作者:Mark Moloney、Laia Josa-Culleré、Amber Thompson
DOI:10.1055/s-0035-1561942
日期:——
The reduction of bicyclic tetramates can be achieved with high levels of diastereocontrol, but small changes in the substitution of the bicyclic lactam system can lead to changes in the steric bias of the concave/convex system. The tetramates and pyroglutamates prepared in this work exhibited limited antibacterial activity.
Efficient enantioselective synthesis of tetramic acids and lactams from threonine
作者:Muhammad Anwar、Mark G. Moloney
DOI:10.1016/j.tetlet.2007.08.052
日期:2007.10
Regioselective Dieckmann and aldol cyclisations using an N-acyloxazolidine derived from threonine give substituted tetramic acids and pyroglutamates in high yield and enantioselectivity. These are easily deprotected under mild conditions to give products, some of which exhibit antibacterial activity.
Novel chiral pyrrolidinone scaffolds derived from threonine with antibacterial activity
作者:Muhammad Anwar、Andrew R. Cowley、Mark G. Moloney
DOI:10.1016/j.tetasy.2010.04.064
日期:2010.7
The synthesis of chiral pyrrolidinones derived from threonine, making use of a Dieckmann or aldol ring closure, is described. Compounds were found to exhibit antibacterial activity, for which the correlation with various physiochemical parameters was examined. This chiral tetramate scaffold may provide a useful template for fragment-based drug design providing rapid access to novel antibacterial compound libraries. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of fused tetramate-oxazolidine and -imidazolidine derivatives and their antibacterial activity
作者:Liban Saney、Tharindi Panduwawala、Xiang Li、Kirsten E. Christensen、Miroslav Genov、Alexander Pretsch、Dagmar Pretsch、Mark G. Moloney
DOI:10.1039/d3ob00594a
日期:——
A chemoselective route which provides direct access to bicyclic tetramates, making use of Dieckmann cyclisation of functionalised oxazolidines and imidazolidines derivedfrom an aminomalonate, is reported; calculations suggest that the observed chemoselectivity is kinetically controlled and leads to the thermodynamically most stable product. Some compounds in the library showed modest antibacterial
报道了一种化学选择性途径,该途径利用衍生自氨基丙二酸酯的官能化恶唑烷和咪唑烷的 Dieckmann 环化作用,可直接获得双环四酸酯;计算表明,观察到的化学选择性是动力学控制的,并导致热力学上最稳定的产物。库中的一些化合物对革兰氏阳性菌表现出适度的抗菌活性,并且这种活性在明确定义的化学空间区域中最大(554 < M w < 722 g mol -1;5.78 < cLogP < 7.16;788 < MSA < 972 Å 2;10.3 < 相对 PSA < 19.08)。