Synthesis of Functionalized Pyridazin-3(2H)-ones via Bromine−Magnesium Exchange on Bromopyridazin-3(2H)-ones
摘要:
The potential of halogen-magnesium exchange reactions, followed by quenching with elect rophiles, for the functionalization of the pyridazin-3(2H)-one core was investigated. 2-Benzyl-4-bromo-5-methoxy-(1), 2-benzyl-5-bromo-4-methoxy- (4), and 2-benzyl-4,5-dibromopyridazin-3(2H)-one (10) were selected as readily available model substrates. While I and 10 gave exclusively C-4 metalation, a tandem reaction involving nucleophilic substitution via addition elimination and bromine-magnesium exchange was observed with 4.
Synthesis of Functionalized Pyridazin-3(2<i>H</i>)-ones via Bromine−Magnesium Exchange on Bromopyridazin-3(2<i>H</i>)-ones
作者:Oxana Ryabtsova、Tom Verhelst、Mattijs Baeten、Christophe M. L. Vande Velde、Bert U. W. Maes
DOI:10.1021/jo9020985
日期:2009.12.18
The potential of halogen-magnesium exchange reactions, followed by quenching with elect rophiles, for the functionalization of the pyridazin-3(2H)-one core was investigated. 2-Benzyl-4-bromo-5-methoxy-(1), 2-benzyl-5-bromo-4-methoxy- (4), and 2-benzyl-4,5-dibromopyridazin-3(2H)-one (10) were selected as readily available model substrates. While I and 10 gave exclusively C-4 metalation, a tandem reaction involving nucleophilic substitution via addition elimination and bromine-magnesium exchange was observed with 4.