Relay Catalysis To Synthesize β-Substituted Enones: Organocatalytic Substitution of Vinylogous Esters and Amides with Organoboronates
作者:Sasha Sundstrom、Thien S. Nguyen、Jeremy A. May
DOI:10.1021/acs.orglett.9b04584
日期:2020.2.21
Organocatalysis was shown to facilitate conjugate additions to vinylogousesters and amides for the first time. Subsequent elimination of a β-alcohol or amine provided π-conjugated β-substituted enones. Remarkably, nucleophile addition to the electron-rich vinylogous substrates is more rapid than classical enones, forming monosubstituted products. A doubly organocatalytic (organic diol and methyl aniline)
A Method for the Preparation of β-Amino-α,β-unsaturated Carbonyl Compounds: Study of Solvent Effect and Mechanism
作者:Reyno R. S.、Akash Sugunan、Ranganayakulu S.、Cherumuttathu H. Suresh、Goreti Rajendar
DOI:10.1021/acs.orglett.9b04531
日期:2020.2.7
An efficient method for the preparation of β-amino-α,β-unsaturated carbonylcompounds is demonstrated. Bench-stable sodium 3-oxo-enolates were prepared from carbonylcompounds, and reacted with amines in the presence of an acid and a desiccant. DFT studies revealed contrasting mechanisms toward the reactivity of aliphatic amines in protic solvents and aromatic amines in aprotic solvents. While the
Scalable Synthesis of Highly Reactive 1,3-Diamino Dienes from Vinamidinium Salts and Their Use in Diels–Alder Reactions
作者:Sida Zhou、Eduardo Sánchez-Larios、Michel Gravel
DOI:10.1021/jo202655h
日期:2012.4.6
A practical and chromatography-free synthesis of vinamidinium salts and their use as diene precursors in Diels–Alder reactions is reported. Additionally, 1,3-dipyrrolidino-1,3-butadiene was shown to be significantly more reactive than Rawal’s diene in a competition experiment.
Discovery and Optimization of DNA Gyrase and Topoisomerase IV Inhibitors with Potent Activity against Fluoroquinolone-Resistant Gram-Positive Bacteria
作者:Guillaume Lapointe、Colin K. Skepper、Lauren M. Holder、Duncan Armstrong、Cornelia Bellamacina、Johanne Blais、Dirksen Bussiere、Jianwei Bian、Cody Cepura、Helen Chan、Charles R. Dean、Gianfranco De Pascale、Bhavesh Dhumale、L. Mark Fisher、Mangesh Fulsunder、Bhavin Kantariya、Julie Kim、Sean King、Lauren Kossy、Upendra Kulkarni、Jay Lakshman、Jennifer A. Leeds、Xiaolan Ling、Anatoli Lvov、Sylvia Ma、Swapnil Malekar、David McKenney、Wosenu Mergo、Louis Metzger、Keshav Mhaske、Heinz E. Moser、Mina Mostafavi、Sunil Namballa、Jonas Noeske、Colin Osborne、Ashish Patel、Darshit Patel、Tushar Patel、Philippe Piechon、Valery Polyakov、Krunal Prajapati、Katherine R. Prosen、Folkert Reck、Daryl L. Richie、Mark R. Sanderson、Shailesh Satasia、Bhautik Savani、Jogitha Selvarajah、Vijay Sethuraman、Wei Shu、Kyuto Tashiro、Katherine V. Thompson、Krishniah Vaarla、Lakhan Vala、Dennis A. Veselkov、Jason Vo、Bhavesh Vora、Trixie Wagner、Laura Wedel、Sarah L. Williams、Satya Yendluri、Qin Yue、Aregahegn Yifru、Yong Zhang、Alexey Rivkin
DOI:10.1021/acs.jmedchem.1c00375
日期:2021.5.13
Herein, we describe the discovery and optimization of a novel series that inhibitsbacterialDNAgyrase and topoisomeraseIV via binding to, and stabilization of, DNA cleavage complexes. Optimization of this series led to the identification of compound 25, which has potent activity against Gram-positive bacteria, a favorable in vitro safety profile, and excellent in vivo pharmacokinetic properties
The n.m.r. spectra of the four geometrical isomers of β-aminoenones, trans-s-trans, trans-s-cis, cis-s-trans, and cis-s-cis, are discussed. It was found that the chemical shift of the α-proton of β-aminoenones depends on both anisotropic effects and the electron density: δ=δ0–Δδstruc=ΔδAr+K(q–q0). Thus the conformation of non-rigid β-aminoenones can be determined from the observed and the calculated