Chelating palladium complexes containing pyridine/pyrimidine hydroxyalkyl di-functionalized N-heterocyclic carbenes: synthesis, structure, and catalytic activity towards C–H activation
作者:Liangru Yang、Jinwei Yuan、Pu Mao、Qi Guo
DOI:10.1039/c5ra21183b
日期:——
novel chelating palladium complexes containing pyridine/pyrimidine hydroxyalkyl di-functionalized N-heterocyclic carbenes (NHCs) via direct metallation of the precursor imidazolium salts is presented. The structure has been characterized unambiguously by X-ray single crystal analysis. Catalytic activity investigation showed that the complexes catalyse the direct C–H bond arylation of (benzo)oxazoles efficiently
A palladium-catalyzed direct desulfitative C-arylation of a benzo[d]oxazole C-H bond with arene sulfonylchlorides is described. The procedure tolerates halo, cyano, nitro, trifluoromethyl, acetyl and acetylamino groups on the phenyl ring of sulfonylchlorides, providing the arylation products in moderate to good yields. It represents a practical and attractive alternative for the synthesis of 2-aryl
Nickel-Catalyzed Coupling of Azoles with Aromatic Nitriles
作者:Mckenna G. Hanson、Noelle M. Olson、Zubaoyi Yi、Grace Wilson、Dipannita Kalyani
DOI:10.1021/acs.orglett.7b01938
日期:2017.8.18
This manuscript describes the Ni-catalyzed coupling of azoles with aromaticnitriles. The use of BPh3 promotes these arylations with electronically diverse azoles and benzonitriles. While the nickel catalyst is necessary for the arylations of phenyl oxazoles, arylation of benzoxazoles with some nitriles affords the arylated products even in the absence of the Ni catalyst albeit in lower yield than
Stable Pd(0) Complexes with Ferrocene Bisphosphanes Bearing Phosphatrioxaadamantyl Substituents Efficiently Catalyze Selective C‐H Arylation of Benzoxazoles by Aryl Chlorides
作者:Filip Horký、Ivana Císařová、Petr Štěpnička
DOI:10.1002/cctc.202101013
日期:2021.11.22
Heterocycle arylation: New donor-asymmetric ferrocene bis-phosphanes structurally related to the ubiquitous 1,1’-bis(diphenylphosphanyl)ferrocene (dppf) equipped with bulky and electron-poor phosphatrioxaadamantylsubstituents have been synthesized and converted into stablePd(0) complexes. The complexes were applied as potent catalysts for Pd-mediated C−H bond arylation of benzoxazoles with aryl chlorides
A compound represented by formula (I) or formula (II):
wherein, A represents an oxygen atom or a sulfur atom; X
1
represents a halogeno group, a substituted or unsubstituted C
1-6
alkyl group and so on; m represents the number of X
1
and is any integer of 0 to 5; any two of X
1
may be bound together to form a bivalent hydrocarbon group; Y represents a single bond or a substituted or unsubstituted C
2-6
alkenylene group; Q
1
represents a substituted or unsubstituted C
6-10
arylene group or a substituted or unsubstituted 6- to 10-membered heteroarylene group; Q
2
represents a substituted or unsubstituted C
6-10
aryl group or a substituted or unsubstituted 5- to 6-membered heteroaryl group; Z
q−
represents a counter ion; and q represents a valence of the counter ion and is 1 or 2.