The regioselective synthesis of 2-alkynyl(benz)imidazoles was successfully achieved by Pd(ii)/Ag(i)-mediated dehydrogenative alkynylation of the corresponding (benz)imidazoles with terminal alkynes in an open vessel.
Highly Efficient and Versatile Pd-Catalyzed Direct Alkynylation of Both Azoles and Azolines
作者:Seok Hwan Kim、Sukbok Chang
DOI:10.1021/ol100488v
日期:2010.4.16
A highly efficient and versatile Pd-catalyzed directalkynylation reaction of heterocycles with 1-bromoalkynes was developed. The substrate scope of the reaction was very broad to include not only azoles but also azolines for the first time, thus offering an important advance in the direct functionalization of heterocycles.
Copper as a Powerful Catalyst in the Direct Alkynylation of Azoles
作者:François Besselièvre、Sandrine Piguel
DOI:10.1002/anie.200904776
日期:2009.12.7
Copper‐bottomed catalysis! The direct alkynylation of azolesthrough a copper‐based CH 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 complementary to the Sonogashira reaction.
Nickel-Catalyzed Synthesis of Oxazoles via C−S Activation
作者:Kyoungsoo Lee、Carla M. Counceller、James P. Stambuli
DOI:10.1021/ol900260g
日期:2009.3.19
The synthesis of 2-substituted oxazoles is achieved via nickel-catalyzed cross-couplingreaction of 2-methylthio-oxazole and various organozinc reagents. An extension of this method is demonstrated with a chemoselective, one-pot synthesis of unsymmetrical 2,5-disubstitutedoxazoles. This synthesis of 2- and 2,5-substituted oxazoles using this method provides great advantages over previous methods for
The invention relates to organic electroluminescent devices comprising organic compounds with a double or triple bond, to which at least one aromatic ring is bonded, as emitter compounds. The invention also relates to possible uses of said devices.