Results 81 to 90 of about 28,372 (298)

Regiospecific synthesis of alkylidene cyclopropanes

, 1979
Alkylidene cyclopropanes are prepared from carbonyl compounds and α-selenolithiocyclopropane with formation of new C-C ...
Krief, A., Halazy, Serge
core   +1 more source

Palladium-Catalyzed Stereoselective Defluorination Arylation/Alkenylation/Alkylation of gem-Difluorinated Cyclopropanes.

Organic Letters, 2019
A palladium-catalyzed cross-coupling of gem-difluorinated cyclopropanes with boronic acids, providing the corresponding arylated/alkenylated/alkylated 2-fluoroallylic scaffolds, is generated.
Ebrahim-Alkhalil M. A. Ahmed, A. Suliman, Tian-Jun Gong, Yao Fu   +3 more
semanticscholar   +1 more source

Donor-Acceptor Cyclopropanes with an Amino Group as Donor

Over the last two decades, a renaissance has been witnessed in the research field of donor-acceptor (DA) cyclopropanes. Among all the subclasses of DA cyclopropanes, DA cyclopropanes with an amino group as donor (DA aminocyclopropanes) have drawn ...
Waser, Jerome, Wang, Ming Ming
core   +1 more source

Synthese von Aminocyclopropanen durch redoxneutrale Aminoalkylierung

Angewandte Chemie, EarlyView.
Wir berichten über eine Synthese von Aminocyclopropanen durch Hydroaminoalkylierung unter Einsatz kostengünstiger, leicht zugänglicher Ausgangsmaterialien. Der Ansatz bietet Orthogonalität zu gängigen Methoden und ermöglicht eine breite Toleranz gegenüber funktionellen Gruppen.
Gwyndaf A. Oliver, Konstantin Günther, Chiara Sebastianelli‐Schoditsch, Sophie Woolford, Iina Ludwig, Harald H. Sitte, Nuno Maulide   +6 more
wiley   +1 more source

Scalable synthesis of (1-cyclopropyl)cyclopropylamine hydrochloride

Beilstein Journal of Organic Chemistry, 2011
1-Cyclopropylcyclopropanecarboxylic acid (2), which is accessible on a large scale (900 mmol) from 1-bromo-1-cyclopropylcyclopropane (1) in 64% yield (89% on a 12.4 mmol scale), has been subjected to a Curtius degradation employing the Weinstock protocol
Sergei I. Kozhushkov, Alexander F. Khlebnikov, Rafael R. Kostikov, Dmitrii S. Yufit, Armin de Meijere   +4 more
doaj   +1 more source

Studien zur Biidung von Cyclopropan- und Oxiran-Derivaten in der Dreikomponentenreaktion von Basen, α-Halogen-acrylsäure-derivaten und Carbonylverbindungen

CHIMIA, 1975
The competitive formation of oxiranes 1 and cyclopropanes 2 in the reaction of 2-halogeno-acrylic acid-derivatives, carbonyl-compounds and bases is discussed.
R. Scheffold, P. Bissig, K.L. Ghatak, B. Granwehr, B. Patwardhan   +4 more
doaj   +1 more source

Reaction of Halogenated Cyclopropanes and Nitrosyl Cation:  Preparation of Isoxazoles

, 2016
Reaction of Halogenated Cyclopropanes and Nitrosyl Cation:  Preparation of ...
Shing-Huey Kuo (3040113), Shaw-Tao Lin (2165785), Fu-May Yang (3040116)   +2 more
core   +1 more source

(2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-Mono(di,tri)fluoromethylcyclopropyl]alanines and their incorporation into hormaomycin analogues

Beilstein Journal of Organic Chemistry, 2014
Efficient and scalable syntheses of enantiomerically pure (2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-mono(di,tri)fluoromethylcyclopropyl]alanines 9a–c, as well as allo-D-threonine (4) and (2S,3R)-β-methylphenylalanine (3), using the Belokon' approach with (S ...
Armin de Meijere, Sergei I. Kozhushkov, Dmitrii S. Yufit, Christian Grosse, Marcel Kaiser, Vitaly A. Raev   +5 more
doaj   +1 more source

Visible-Light-Mediated Energy Transfer Enables Cyclopropanes Bearing Contiguous All-Carbon Quaternary Centers

, 2023
Cyclopropanes bearing contiguous all-carbon quaternary centers continue to attract attention due to their bioactivities. However, methods to obtain cyclopropanes with contiguous all-carbon quaternary centers remain largely unexplored due to the high ...
Dingding Xia, Xinyu Han, Yu Zhang, Jinxin Wang, Qiannan Li, Xin Luan, Xin Luan (706080), Xin Hong (95011), Wei-Dong Zhang (673110), Yanchuan Li, Wei-Dong Zhang, Rongkai Wu, Xinyu Han (2237545), Qiannan Li (1676221), Xin Hong, Rongkai Wu (16527446), Yanchuan Li (4411861), Yu Zhang (12946), Jinxin Wang (1696837), Dingding Xia (16527443)   +19 more
core   +1 more source

Highly diastereo- and enantioselective synthesis of trifluoromethyl-substituted cyclopropanes via myoglobin-catalyzed transfer of trifluoromethylcarbene

Journal of the American Chemical Society, 2017
We report on an efficient strategy for the asymmetric synthesis of trifluoromethyl-substituted cyclopropanes by means of myoglobin-catalyzed olefin cyclopropanation reactions in the presence of 2-diazo-1,1,1-trifluoroethane (CF3CHN2) as the carbene donor.
Antonio Tinoco, Viktoria Steck, V. Tyagi, R. Fasan   +3 more
semanticscholar   +1 more source