A Mild and Direct Site-Selective sp2 C–H Silylation of (Poly)Azines
摘要:
A base-mediated protocol that allows for the site-selective sp(2) C-H silylation of azines is described. This method is distinguished by its mild conditions, simplicity and excellent site-selective modulation for a diverse set of azines, even in the context of late-stage functionalization, while exhibiting orthogonal reactivity with classical silylation reactions.
Ligand-Promoted C3-Selective Arylation of Pyridines with Pd Catalysts: Gram-Scale Synthesis of (±)-Preclamol
作者:Mengchun Ye、Guo-Lin Gao、Andrew J. F. Edmunds、P. A. Worthington、James A. Morris、Jin-Quan Yu
DOI:10.1021/ja209510q
日期:2011.11.30
The first example of Pd-catalyzed, C3-selective arylation of unprotected pyridines has been developed by employing a catalytic system consisting of Pd(OAc)(2) and 1,10-phenanthroline. This protocol provides an expeditious route to an important class of 3-arylpyridines and 3-arylpiperidines frequently found in bioactive compounds. A brief synthesis of the drug molecule (+/-)-preclamol is also reported.