2008
DOI: 10.1021/ja8026295
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Palladium-Catalyzed C−H Functionalization of Pyridine N-Oxides: Highly Selective Alkenylation and Direct Arylation with Unactivated Arenes

Abstract: Two catalytic protocols of the oxidative C-C bond formation have been developed on the basis of the C-H bond activation of pyridine N-oxides. Pd-catalyzed alkenylation of the N-oxides proceeds with excellent regio-, stereo-, and chemoselectivity, and the corresponding ortho-alkenylated N-oxide derivatives are obtained in good to excellent yields. Direct cross-coupling reaction of pyridine N-oxides with unactivated arene was also developed in the presence of Pd catalyst and Ag oxidant, which affords ortho-aryla… Show more

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Cited by 666 publications
(162 citation statements)
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References 50 publications
(16 reference statements)
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“…Based on their studies directed towards intermolecular cross-dehydrogenative arylations (see below), Fagnou and coworkers probed a related approach for the synthesis of naturally occurring mukonine (76), which proceeded under phosphine-free reaction conditions (Scheme 27). [55] Intermolecular dehydrogenative homocoupling of (hetero)arenes is one of the most useful tools for the preparation of symmetrically substituted 1,1'-binaphthyls, which are, amongst other things, of major importance as ligand precursors in asymmetric catalysis.…”
Section: Dehydrogenative Arylationmentioning
confidence: 99%
“…Based on their studies directed towards intermolecular cross-dehydrogenative arylations (see below), Fagnou and coworkers probed a related approach for the synthesis of naturally occurring mukonine (76), which proceeded under phosphine-free reaction conditions (Scheme 27). [55] Intermolecular dehydrogenative homocoupling of (hetero)arenes is one of the most useful tools for the preparation of symmetrically substituted 1,1'-binaphthyls, which are, amongst other things, of major importance as ligand precursors in asymmetric catalysis.…”
Section: Dehydrogenative Arylationmentioning
confidence: 99%
“…Wichtige Arbeiten auf diesem Gebiet konnten bisher zeigen, dass Heteroarene wie Pyridine [43] und Pyridin-N-oxide, [44] aber auch verschiedene funktionelle Gruppen wie Acetanilide, [45, 46, 48b] Ester, [47] Carbamate, [48a] Imine [49] 2008 berichteten Shi [45] und Buchwald [46] …”
Section: Angewandte Chemieunclassified
“…[22] In einem neueren Bericht beschreiben Chang et al eine nützliche Olefinierung von Pyridin-N-oxiden (Schema 14). [23] Die Reaktivität von Pd-Katalysatoren gegenüber Pyridin-N-oxiden war zuvor auch von Fagnou et al bei Arylierungen beobachtet worden. [24] Schließlich wurde durch die Entwicklung einer meta-C-HAktivierung/Olefinierung eine neuartige Reaktivität erzielt (Schema 15).…”
Section: Introductionunclassified