Results 131 to 140 of about 30,863 (282)

Boron trifluoride-mediated domino dehydration/electrophilic cyclization of alkynols: mechanistic insights and origin of stereoselectivity. [PDF]

RSC Adv
Okitsu T, Yoshikawa T, Takayori Y, Hirata S, Shinoki M, Ito M, Sakata K, Hatano M.   +7 more
europepmc   +1 more source

Synthesis and Structures of Novel Chiral Cyclic Hypervalent Iodine(III) Reagents for Metal‐Free Ligand‐Transfer Reactions

Chemistry – A European Journal, EarlyView.
Several new chiral cyclic hypervalent iodine(III) reagents have been synthesized and characterized. Carbon‐based ligands were successfully installed onto the hypervalent iodine centers, giving thus access to novel chiral cyano‐, trifluoromethyl‐ or alkynyl‐bearing λ3‐iodanes.
Emmanuel Valzer, Jean‐Marc Sotiropoulos, Karinne Miqueu, Laurent Pouységu, Stéphane Quideau   +4 more
wiley   +1 more source

Catalytic Asymmetric Dearomative Cyclizations of Indolyldimethanols via Umpolung Strategy. [PDF]

JACS Au
Wu P, Zhang WT, Yu XY, Li X, Tan W, Shi F.   +5 more
europepmc   +1 more source

Rhodium‐Catalyzed Synthesis of Enantioenriched α‐Substituted Primary Amines Through Asymmetric Transfer Hydrogenation

Chemistry – A European Journal, EarlyView.
Enantioenriched α‐substituted primary amines are efficiently prepared by rhodium‐catalyzed asymmetric transfer hydrogenation of ortho‐hydroxyaryl N─H imines under mild conditions using a low catalyst loading and ammonium formate as the hydrogen source in high yields (up to 99%) and enantioselectivities (up to 99% ee).
Chonghuo Liu, Guillaume Lefèvre, Qin Yin, Phannarath Phansavath, Virginie Ratovelomanana‐Vidal   +4 more
wiley   +1 more source

Stereoselectivity of Galactosylation Reactions In Vacuo. [PDF]

J Am Chem Soc
Chang CW, Zviagin A, Wehner D, Geue N, Jordan JS, Zidar A, Wieseke AR, Greis K, Vos GM, Götze M, Boyarkin O, Pagel K.   +11 more
europepmc   +1 more source

N‐Sulfonyl Azalevoglucosan: A Versatile Platform for the Synthesis of Polysubstituted Piperidines

Chemistry – A European Journal, EarlyView.
Gain by strain: The synthesis of a levoglucosan analog, in which the pyranose oxygen has been replaced by a nitrogen, allows navigation on the piperidine ring to iteratively install functional groups at C1, C2, C3, C4, and C6 positions using simple experimental protocols with minimal protecting group manipulation.
Dylan Yorga, Jérôme Marrot, Ana Poveda, Nicolas Auberger, Jesús Jiménez‐Barbero, Jérôme Désiré, Yves Blériot   +6 more
wiley   +1 more source

Recent Advances in Enantioselective Desymmetrization Enabled by Chiral Phosphoric Acid Catalysis. [PDF]

Chirality
Zhang D, Xu B, Yang Y, Zhang D.
europepmc   +1 more source

Stereoselective Synthesis of β‐C‐glycosides From Exoglycals Through Radical C─C Bond Formation

Chemistry – A European Journal, EarlyView.
We describe herein a convenient strategy for the preparation of β‐C‐glycosides via the addition of radical species onto exoglycals. This method is efficient, general and achieved in mild conditions starting from xanthates derivatives and using triethylborane as initiator and 4‐tert‐butylcatechol as hydrogen atom source. This hydroalkylation reaction is
Noémie Murard, Guillaume Pilet, David Gueyrard   +2 more
wiley   +1 more source

Access to Uncharted (Ethoxy)difluoromethylated‐Containing Tetrahydrofurans by Hydrogenation

Chemistry – A European Journal, EarlyView.
A Pd/C‐catalyzed selective hydrogenation of (ethoxy)difluoromethylated‐containing tetrahydrofurans was achieved. Depending on the pressure of H2, a divergent process led to either cis CF2CO2Et‐containing tetrahydrofurans or valuable α,α‐difluoro‐β‐hydroxyesters, offering key fluorinated building blocks for drug discovery while keeping the CF2CO2Et ...
Thibaud Charvillat, Victor Levet, Patrick Bernardelli, Marc Daumas, Hassan Oulyadi, Muriel Sebban, Vincent Ferey, Tatiana Besset   +7 more
wiley   +1 more source

Carboxylate–Probase Catalyzed Favorskii Reaction

Chemistry – A European Journal, EarlyView.
Stronger together: A combination of a carboxylate catalyst and a silylating agent generates a stronger base catalyst for a metal‐free catalytic addition of alkynes to aldehydes and ketones under chemoselective, O‐silylative conditions. The reaction is proposed to proceed via quaternary ammonium (Q+) cation – acetylide anion ion pairs, with chiral ...
Anton Bannykh, Sanna M. Stenfors, Anton Nechaev, John M. Fiskari, Petri M. Pihko   +4 more
wiley   +1 more source