Results 51 to 60 of about 17,659 (225)
Preparation of chiral ruthenium(IV) complexes and applications in regio- and enantioselective allylation of phenols. [PDF]
, 2011 International audienceFacile preparations of chiral [Ru(Cp*)]- and [Ru(Cp')]-based allyl complexes featuring N,O chelate derived from (+)-nopinone are described.
Achard, Mathieu +7 more
core +5 more sources
Alkali‐Metal Base Catalyzed Electrocyclization of Isoprene Derivatives
Chemistry – A European Journal, EarlyView.Simple and abundant alkali‐metal base catalysis in combination with Lewis basic polyamines enables the electrocyclization of isoprene‐derived trienes to cycloheptadienes under neat conditions. Mechanistic insight supported by DFT guides a scalable route to seven‐membered carbocycles which, after reduction, give saturated cycloalkanes relevant as ...
Mikaël Le Roch +3 more
wiley +1 more source
Catalytic enantioselective synthesis of quaternary carbon stereocentres. [PDF]
, 2014 Quaternary carbon stereocentres-carbon atoms to which four distinct carbon substituents are attached-are common features of molecules found in nature. However, before recent advances in chemical catalysis, there were few methods of constructing single ...
Overman, Larry E, Quasdorf, Kyle W
core
Recent advances in the use of chiral aldimines in asymmetric synthesis [PDF]
, 2016 Chiral N-(tert-butyl)sulfinyl aldimines easily prepared from commercially available compounds have been used as starting materials for the following processes: (i) hydrogen transfer, (ii) addition of zincates, (iii) In-promoted allylation, and (iv ...
Foubelo, Francisco, Yus, Miguel
core +2 more sources
European Journal of Organic Chemistry, EarlyView.This electrochemical methodology allows the preparation of bridged tricyclic scaffolds through a rapid increase in the molecular complexity of simple and readily accessible starting materials. Alcohols proved to be the most efficient nucleophiles, as well as 6‐chloropurine. Plausibly, the process involves an anodic oxidative dearomatization to generate
Emanuele Cartamina +4 more
wiley +1 more source
Asymmetric organocatalytic synthesis of chiral homoallylic amines
Beilstein Journal of Organic ChemistryIn recent decades, the chiral allylation of imines emerged as a key methodology in the synthesis of alkaloids and natural products with 4-, 5- and 6-membered cyclic amine motifs.
Nikolay S. Kondratyev, Andrei V. Malkov
doaj +1 more source
Synthesis and catalytic activities of porphyrin-based PCP pincer complexes. [PDF]
, 2013 2, 18-Bis(diphenylphosphino)porphyrins undergo peripheral cyclometalation with group 10 transition-metal salts to afford the corresponding porphyrin-based PCP pincer complexes.
Fujimoto, Keisuke +3 more
core +1 more source
Advances in the Different Synthetic Routes of Fluorinated Hydrazines
The Chemical Record, EarlyView.This review highlights the various routes to the preparation of fluorinated hydrazines, thereby promoting the exploration of innovative methods for the synthesis of new N‐fluorinated hydrazines. Their synthesis mainly involves synthetic routes such as organometallic, organocatalytic, and photocatalytic.
Dimitra Kyrko, Benoît Crousse
wiley +1 more source
Chain walking of allylrhodium species towards esters during rhodium-catalyzed nucleophilic allylations of imines [PDF]
, 2015 Allylrhodium species derived from δ-trifluoroboryl β,γ-unsaturated esters undergo chain walking towards the ester moiety.The resulting allylrhodium species react with imines to give products containing two new stereocenters and a Z-alkene.
Althaus +46 more
core +4 more sources
Enantioselective Total Synthesis of (+)-Cassiol [PDF]
, 2009 An enantioselective total synthesis of (+)-cassiol is reported. The complex derived from Pd-2(pmdba)(3) and enantiopure t-BuPHOX ligand catalyzes enantioconvergent decarboxylative alkylation to generate the quaternary carbon stereocenter at an early ...
Mohr, Justin T. +2 more
core +2 more sources