Grignard reagent-promoted 6-endo-dig cyclization: instantaneous synthesis of original dipyrido[1,2-a:3′,4′-d]imidazole
作者:Romain Oudot、Philippe Costes、Hassan Allouchi、Mélanie Pouvreau、Mohamed Abarbri、Alain Gueiffier、Cécile Enguehard-Gueiffier
DOI:10.1016/j.tet.2011.09.120
日期:2011.12
Dipyrido[1,2-a:3′,4′-d]imidazole derivatives can be readily synthetized from various 3-alkyne-2-cyanoimidazo[1,2-a]pyridines via an efficient Grignard reagent-promoted 6-endo-dig cyclization of nitrile to alkynes. A previous optimization of the Sonogashira coupling reaction at C(3) of the 2-cyanoimidazo[1,2-a]pyridine was necessary as this coupling reaction is known to be largely influenced by the
可以通过有效的格氏试剂促进的6-内基-由各种3-炔基-2-氰基咪唑并[1,2- a ]吡啶容易地合成二吡啶并[1,2- a:3',4'- d ]咪唑衍生物。将腈环化成炔烃。在2-氰基咪唑并[1,2- a ]吡啶的C(3)处进行Sonogashira偶联反应的先前优化是必要的,因为已知该偶联反应很大程度上受2-取代基的性质影响。