Results 81 to 90 of about 33,950 (227)
Regioselective reactions of 3,4-pyridynes enabled by the aryne distortion model. [PDF]
, 2013 The pyridine heterocycle continues to play a vital role in the development of human medicines. More than 100 currently marketed drugs contain this privileged unit, which remains highly sought after synthetically. We report an efficient means to access di-
Garg, Neil K, Goetz, Adam E
core
Phosphine-free palladium-catalysed direct C2-arylation of benzothiophenes with aryl bromides [PDF]
, 2013 Copies of 1H and 13C NMR spectra of new compounds are available (attached file).International audienceLigand-free Pd(OAc)2 was found to catalyse very efficiently the direct C2-arylation of benzothiophene derivatives under low catalyst concentration.
Bruneau, Christian +2 more
core +3 more sources
Ferrocenyl-aryl-plumbane / Ferrocenyl-aryl-plumbanes
Zeitschrift für Naturforschung B, 1990 The first example of a diplumba[1.1]ferrocenophane[cpPb(ø2)cp]2Fe2 has been prepared from ø2PbCl2 and 1,1′-dilithioferrocene 2 TMEDA. The preparation of further four ferrocenyl-phenyl-plumbanes, including the hitherto unknown compounds (ø3Pbcp)2Fe, Fc2Pb2ø2 and [(ø3Pb)cpFecp]FcPbø2 has been achieved by reaction of a mixture of monolithioferrocene ...
Gerhard Utri +2 more
openaire +1 more source
Chemistry – A European Journal, EarlyView.This review summarizes recent advances in copper‐ and silver‐catalyzed reactions of active methylene isocyanides for the synthesis of highly substituted five‐ and six‐membered heterocycles. Emphasis is placed on [3+n] cycloadditions, annulations, and asymmetric strategies, highlighting current limitations and future opportunities in heterocycle ...
Jimil George, Kyungsoo Oh
wiley +1 more source
Catalyst-Switchable Regiocontrol in the Direct Arylation of Remote C—H Groups in Pyrazolo[1,5-a]pyrimidines [PDF]
, 2015 The regiodivergent palladium-catalyzed C–H arylation of pyrazolo[1,5-a]pyrimidine has been achieved, wherein the switch in regioselectivity between positions C3 and C7 is under complete catalyst control. A phosphine-containing palladium catalyst promotes
Bedford, Robin B +2 more
core +2 more sources
Boron Arylations of Subporphyrins with Aryl Zinc Reagents [PDF]
Chemistry – A European Journal, 2016 AbstractBoron arylations of B‐(methoxo)triphenylsubporphyrin have been developed with a combined use of ArZnI⋅LiCl and trimethylsilyl chloride. Aryl zinc reagents bearing bromo, cyano, amide, and ester groups can be employed for the B‐arylation reaction to provide the corresponding B‐arylated subporphyrins in moderate yields.
Kotani, Ryota +3 more
openaire +3 more sources
Bifunctional Photocatalysts: Exploiting Proximity for Enhanced Reaction Performance
Chemistry – A European Journal, EarlyView.This review covers the application of the bifunctional approach to photocatalysis as a means to attain (enhanced) enantioselectivity, and, more in general, as a strategy to enhance the catalytic performance through an effective use of short‐lived reaction intermediates.
Luigi Dolcini +3 more
wiley +1 more source
Nature CommunicationsSite-selective C(sp3)–H arylation is an appealing strategy to synthesize complex arene structures but remains a challenge facing synthetic chemists. Here we report the use of photoredox-mediated hydrogen atom transfer (HAT) catalysis to accomplish the ...
Jie Xu +5 more
doaj +1 more source
(R)-(−)-2-[(5-Oxido-5-phenyl-5λ4-isoquino[4,3-c][2,1]benzothiazin-12-yl)amino]benzonitrile
Molbank, 2014 Copper-catalyzed cross-coupling between (S)-S-methyl-S-phenylsulfoximine (1) and 2-iodobenzonitrile (2) resulted in the discovery of an unprecedented one-pot triple arylation sequence to give (R)-(−)-2-[(5-oxido-5-phenyl-5λ4-isoquino[4,3-c][2,1 ...
Marcus Frings +2 more
doaj +1 more source
Synthesis of Novel 3,6-Dithienyl Diketopyrrolopyrrole Dyes by Direct C-H Arylation
Molecules, 2020 Direct C-H arylation coupling is potentially a more economical and sustainable process than conventional cross-coupling. However, this method has found limited application in the synthesis of organic dyes for dye-sensitized solar cells. Although direct C-
Amsalu Efrem Yemene +4 more
doaj +1 more source