Results 61 to 70 of about 16,892 (273)
Lithiation and Trapping of Acyclic Sulfoximines: Scope and Diastereoselectivity [PDF]
, 2019 This thesis describes the diastereoselective synthesis of a wide range of α-functionalised acyclic sulfoximines via lithiation-trapping methodology. The diastereoselective synthesis of some tetrasubstituted sulfoximines is also presented.
Hindle, Alexandra
core
, 2019 Intramolecular imino-ene reaction of 2H-aziridine has been studied experimentally and computationally, demonstrating that (1) the concerted process takes place regioselectively on the alkene E-CH group; (2) the geometry of the N-linker impacts the ...
Ping Dai (235336) +15 more
core +1 more source
MoleculesRing size-dependent diastereoselective coordination of unsymmetrical diamines containing one azacyclic nitrogen and one exocyclic nitrogen to [(η5-C5Me5)MCl]+ cores where M = Rh, Ir and [Ru(η6-cymene)Cl]+ is reported herein.
Vladimir Y. Vladimirov +4 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2016 An effective and highly regio- and diastereoselective one-pot method for the synthesis of new polynuclear dispiroheterocyclic systems with five stereogenic centers (dispiro[imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-6,3′-pyrrolidine-2′,3′′-indoles ...
Alexei N. Izmest’ev +9 more
doaj +1 more source
Diastereoselective Ugi reaction for the synthesis of unnatural amino esters
Orbital: The Electronic Journal of Chemistry, 2012 Multicomponent Reactions (MCR) are useful reactions to obtain complex products by the simple mixture of 3 or more reactants. The classic Ugi reaction (4-UCR) involves a mixture of an amine, aldehyde, isocyanide and a carboxylic acid, giving peptoides as ...
Rafael Oliveira Rocha +4 more
doaj +1 more source
International Journal of Chemistry, 2011 This study was aimed at determining the effect, if any, that steric factors may have on the diastereoselectivity in the spiroannulation of simple phenols. A series of phenols bearing different size substituents ortho to the phenolic hydroxyl were synthesized and spiroannulated to the corresponding spiroethers in good to excellent yields (76-94 ...
Guy L Plourde, Lyndia M. Susag
openaire +2 more sources
Vinylogous functionalization of 4-alkylidene-5-aminopyrazoles with methyl trifluoropyruvates
Beilstein Journal of Organic ChemistryA valuable vinylogous addition reaction between 4-alkylidene-5-aminopyrazoles and alkyl trifluoropyruvates leading to highly functionalized tertiary alcohols bearing a trifluoromethyl group and a pyrazole ring is presented.
Judit Hostalet-Romero +5 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2017 Diastereoselective radical coupling was achieved with chiral auxiliaries. The radicals were generated by anodic decarboxylation of five malonic acid derivatives. These were prepared from benzyl malonates and four menthol auxiliaries.
Matthias C. Letzel +2 more
doaj +1 more source
Molecules, 2013 We conducted diastereodifferentiating [2+2] photocycloadditions of cyclo-hexenones modified with a chiral 8-(p-methoxy phenyl)menthyl auxiliary with olefins in water.
Yasuhiro Nishiyama +6 more
doaj +1 more source
Fluorine‐Directed Diastereoselective Iodocyclizations
Angewandte Chemie International Edition, 2007 An inside job: β‐Fluorinated lactones and tetrahydrofurans are synthesized by iodocyclization of various allylic fluorides. The fluorine substituent acts as a highly efficient syn‐stereodirecting group for the ring closure. The experimental results combined with theoretical studies provide evidence in support of an “inside fluoro effect” to account for
Tredwell, M +5 more
openaire +2 more sources