C–H Arylation of Pyridines: High Regioselectivity as a Consequence of the Electronic Character of C–H Bonds and Heteroarene Ring
摘要:
We report a new catalytic protocol for highly selective C-H arylation of pyridines containing common and synthetically versatile electron-withdrawing substituents (NO(2), CN, F and Cl). The new protocol expands the scope of catalytic azine functionalization as the excellent regioselectivity at the 3- and 4-positions well complements the existing methods for C-H arylation and Ir-catalyzed borylation, as well as classical functionalization of pyridines. Another important feature of the new method is its flexibility to adapt to challenging substrates by a simple modification of the carboxylic acid ligand or the use of silver salts. The regioselectivity can be rationalized on the basis of the key electronic effects (repulsion between the nitrogen lone pair and polarized C-Pd bond at C2-/C6-positions and acidity of the C-H bond) in combination with steric effects (sensitivity to bulky substituents).
Trifluoromethylpyrrolecarboxamides and Trifluoromethylpyrrolethioamides as fungicides
申请人:——
公开号:US20040171490A1
公开(公告)日:2004-09-02
Novel pyrrole derivatives of formula I
1
wherein
X is oxygen or sulfur;
R
1
is hydrogen, C
1
-C
4
alkyl unsubstituted or substituted, or halogen;
R
2
is C
1
-C
4
alkyl unsubstituted or substituted; and
A is orthosubstituted aryl; orthosubstituted heteroaryl; bicycloaryl unsubstituted or substituted; or bicycloheteroaryl unsubstituted or substituted.
The novel compounds have plant-protective properties and are suitable for protecting plants against infestations by phytopathogenic microorganisms.
Trifluoromethylpyrrole carboxamides and trifluoromethylpyrrolethioamides as fungicides
申请人:Syngenta Crop Protection, Inc.
公开号:US06699818B1
公开(公告)日:2004-03-02
Novel trifluoromethylpyrrolcarboxamides of the formula (I)
wherein R1, R2, and A are as defined in the specification, which are suitable for protecting plants against infestations by phytopathogenic microorganisms.