Lithiation and functionalization of 1-alkynylimidazoles at the 2-position
摘要:
Functionalization reactions of 1-alkynylimidazoles involving the formation of their 2-lithio derivatives followed by addition of various electrophiles are presented. This allows access to previously unreported 1,2-dialkynylimidazoles via 1-alkynyl-2-iodoimidazoles. The use of an aldehyde or sulfonimine electrophiles allows the direct formation of bicyclic ring systems. (C) 2009 Elsevier Ltd. All rights reserved.
Lithiation and functionalization of 1-alkynylimidazoles at the 2-position
作者:Christophe Laroche、Sean M. Kerwin
DOI:10.1016/j.tetlet.2009.06.133
日期:2009.9
Functionalization reactions of 1-alkynylimidazoles involving the formation of their 2-lithio derivatives followed by addition of various electrophiles are presented. This allows access to previously unreported 1,2-dialkynylimidazoles via 1-alkynyl-2-iodoimidazoles. The use of an aldehyde or sulfonimine electrophiles allows the direct formation of bicyclic ring systems. (C) 2009 Elsevier Ltd. All rights reserved.
Exploring the synthetic utility of 1-alkynylimidazoles: regiocontrolled cyclization to diverse imidazoazines and imidazoazoles
作者:Christophe Laroche、Bradford Gilbreath、Sean M. Kerwin
DOI:10.1016/j.tet.2014.04.099
日期:2014.7
Regiocontrolled cyclizations involving alkynes have utility in the formation of diverse heterocyclicsystems. Here we report the participation of model 1-alkynylimidazoles in intramolecular hydroalkoxylation and hydroamination reactions leading to diverse imidazoazine and imidazoazole ring systems. In many cases, the preference for 5-exo-dig or 6-endo-dig cyclization can be controlled by variations