Disulfide-based metal-free α-sulfanylation of ketones
作者:Andrea F. Vaquer、Angelo Frongia、Francesco Secci、Enrica Tuveri
DOI:10.1039/c5ra17913k
日期:——
An eco-friendly methodology for the direct α-sulfanylation of ketones has been developed by using diaryl disulfides as sulfanyl source affording ketosulfides in good to excellent yields and high selectivity.
Enantioselective Construction of Sulfur‐Containing Tetrasubstituted Stereocenters via Asymmetric Functionalizations of α‐Sulfanyl Cyclic Ketones
作者:Xueqian Ye、Yongkai Pan、Yunrong Chen、Xiaoyu Yang
DOI:10.1002/adsc.202000520
日期:2020.8.19
functionalizations of α‐sulfanyl cyclic ketones were realized via chiralphosphoricacid catalyzed enantioselective addition reactions with aldimines, azodicarboxylates and allenamides. A series of chiral organosulfur compounds possessing sulfur‐containing tetrasubstituted stereocenters were accessed via these methods, with excellent regioselectivities and high stereoselectivities.
A facile and efficient protocol for the α-benzoyloxylation of β-keto sulfides is presented. This methodology provides a step-economical, mild and practical access to highly functionalized α-O-benzoyloxy substituted β-keto sulfides, including those with quaternary carbons, which are not easily obtained through currently available methods.
Deracemizing organocatalyzed Michael addition reactions of 2-(arylthio)cyclobutanones with β-nitrostyrenes
作者:Alberto Luridiana、Angelo Frongia、David J. Aitken、Regis Guillot、Giorgia Sarais、Francesco Secci
DOI:10.1039/c6ob00160b
日期:——
Organocatalyzed Michael addition reactions of 2-(arylthio)cyclobutanones with trans-β-nitrostyrenes have been carried out using a bifunctional thiourea-primary amine catalyst, providing diastereoisomerically and enantiomerically enriched 2-alkyl-2-(arylthio)cyclobutanones having two contiguous stereocenters of which one is a chiral quaternary center. The absolute configuration of these novel adducts
Insights into the Reactivity of 2-Hydroxycyclobutanones with Thiols Corroborated by Quantum Chemical DFT Investigations and NMR and Raman Analysis
作者:Armando Carlone、Francesco Secci、Stefania Porcu、Maria Chiara Cabua、Viktoria Velichko、Jean-Pierre Baltaze、Angelo Frongia、Carlo Maria Carbonaro、Pier Carlo Ricci、Drew Francis Parsons
DOI:10.1055/a-1912-1096
日期:2022.12
broad substrate scope. Mechanistic aspects and kinetic parameters were investigated by quantum chemical DFT calculations, allowing us to rationalize the different reactivity of 2-aryl- and 2-alkyl-substituted 2-hydroxycyclobutanones towards thiol nucleophiles in reactions mediated by sulfonicacids. NMR and in situ Raman techniques were employed to better understand the reaction kinetics and parameters