Palladium(II)-catalyzed oxidative C-H/C-H cross-coupling between two structurally similar azoles
Power of two: A widely functional-group tolerant, selective and rapid oxidative cross-coupling between two structurally similar azoles has been carried out by using a palladium/copper co-catalytic twofold C-H activation method (see scheme). Copyright
Copper(II)-catalyzed dehydrogenative cross-coupling between two azoles
The copper(II)-catalyzed dehydrogenative coupling between two different azoles for the preparation of unsymmetrical biazoles has been developed. The current catalytic system can effectively control the chemoselectivity for heterocoupling over homocoupling.
Copper as a powerful catalyst in the direct alkynylation of azoles
[Chemical equation presented] Copper-bottomed catalysis! The direct alkynylation of azoles through a copper-based C - H bond activation, using alkynylbromides as the coupling partner, has been developed (see scheme). The method is very rapid, is functional-group tolerant, and provides a straightforward entry to diverse alkynyl heterocycles that is complementry to the Sonogashira reaction.
Besselievre, Francois,Piguel, Sandrine
supporting information; scheme or table
p. 9553 - 9556
(2010/03/25)
Stereoselective direct copper-catalyzed alkenylation of oxazoles with bromoalkenes
(Chemical Equation Presented) A copper-catalyzed direct alkenylation of oxazoles with bromoalkenes has been developed. The method is both regio- and stereoselective and tolerates a variety of functional groups. A wide range of 2-E-vinyl-substituted oxazoles were obtained in high yields including the highly fluorescent alkaloid annuloline.
Besselievre, Francois,Piguel, Sandrine,Mahuteau-Betzer, Florence,Grierson, David S.
supporting information; experimental part
p. 4029 - 4032
(2009/06/18)
Metalation of oxazole-borane complexes: A practical solution to the problem of electrocyclic ring opening of 2-lithiooxazoles
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Vedejs, Edwin,Monahan, Sean D.
p. 5192 - 5193
(2007/10/03)
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