Relative<i>ortho</i>-directing power of fluorine, chlorine and methoxy group for the metalation reaction in the diazine series. Diazines XXXV
作者:Frédéric Toudic、Alain Turck、Nelly Plé、Guy Quéguiner、Mircea Darabantu、Thierry Lequeux、Jean Claude Pommelet
DOI:10.1002/jhet.5570400517
日期:2003.9
The regioselectivity of the metalation of 2-chloro-6-methoxypyrazine, 2-fluoro-6-methoxypyrazine and 3-fluoro-6-chloropyridazine was studied; the relative ortho-directing power was F > OMe > Cl.
A new two step strategy for the preparation of 1,4-benzodiazepin-2-ones has been developed starting from the 2-halogenobenzophenone under Buchwald conditions (Pd(OAc)(2), XantPhos, Cs2CO3, dioxane 100 degrees C). This strategy has been extended to two 2-halogeno-3-benzoyl-azines (pyridines, pyridazines). (C) 2011 Elsevier Ltd. All rights reserved.