Deprotonation of pyridine carboxamides using lithium magnesiates bases
摘要:
Regioselective deprotonation of N-methyl- and tert-butylpyridine carboxamides using lithium magnesiates bases was achieved at room temperature avoiding nucleophilic addition on the pyridine molecule and auto-condensation of the arylmetal intermediates on the amide group was described. The hydrogen-magnesium exchange was evidenced using H-1 NMR spectroscopy at room temperature and the reactivity of the lithium 2- 3- and 4-carboxamidopyridinylmagnesiates complexes towards electrophiles and in cross-coupling reactions was studied. (c) 2008 Elsevier Ltd. All rights reserved.
Regioselective deprotonation of N-methyl- and tert-butylpyridine carboxamides using lithium magnesiates bases was achieved at room temperature avoiding nucleophilic addition on the pyridine molecule and auto-condensation of the arylmetal intermediates on the amide group was described. The hydrogen-magnesium exchange was evidenced using H-1 NMR spectroscopy at room temperature and the reactivity of the lithium 2- 3- and 4-carboxamidopyridinylmagnesiates complexes towards electrophiles and in cross-coupling reactions was studied. (c) 2008 Elsevier Ltd. All rights reserved.