Arylation, Alkenylation, and Alkylation of 2-Halopyridine <i>N</i>-Oxides with Grignard Reagents: A Solution to the Problem of C2/C6 Regioselective Functionalization of Pyridine Derivatives
alkenylation, and alkylation of functionalized 2-halopyridine N-oxides with various Grignard reagents was developed. It represented a highly efficient and selective C–H bond functionalization of pyridine derivatives in the presence of reactive C–Cl or C–Br bonds. Using Cl or Br as a blocking group, C2/C6 site-controllable functionalization of pyridine derivatives has been achieved. Various pyridine compounds
Imidazole compounds and their therapeutic applications
申请人:Institut National de la Sante et de la Recherche Medicale
公开号:US05559113A1
公开(公告)日:1996-09-24
A compound selected from the group consisting of a compound of the formula ##STR1## wherein the substituents are defined as in the specification having antagonist properties to histamine H.sub.3 -receptors.
Facile One-Pot Direct Arylation and Alkylation of Nitropyridine <i>N</i>-Oxides with Grignard Reagents
作者:Fang Zhang、Xin-Fang Duan
DOI:10.1021/ol202597b
日期:2011.11.18
Facile arylation and alkylation of nitropyridine N-oxides were developed through the reactions of Grignardreagents with nitropyridine N-oxides. For the same 4-nitropyridine N-oxide, arylation occurred at the 2- (or 6-) position, whereas alkylation occurred at the 3-position in an adjustably site-selective manner. The cooperative action of the two groups was discovered in the reactions of 3-nitropyridine