quater‐heteroaryls have been prepared under indium catalysis by nucleophilicaromaticsubstitution (SNAr). This is the first example of catalytic heteroaryl–heteroaryl bond formation based on SNAr between two heteroaryl substrates without needing activating groups to enhance their reactivity (see scheme; El=electrophile, In=In(OTf)3 or In(ONf)3, Nu=nucleophile).
独特的性能:在铟催化下,通过亲核芳族取代(S N Ar)制备了二,三和四杂杂芳基。这是基于两个杂芳基底物之间基于S N Ar的催化杂芳基-杂芳基键催化形成的第一个示例,无需活化基团来增强其反应性(参见方案; El =亲电子试剂,In = In(OTf)3或In(ONf)3,Nu =亲核试剂)。
Pyridine compounds, process for their preparation and systems containing them
申请人:STERLING DRUG INC.
公开号:EP0061128A1
公开(公告)日:1982-09-29
Novel 4-aryl- or heteroaryl-2,6-bis(heteroaryl) or [(substituted-amino) phenyl] pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting an aryl or heteroaryl methyl ketone with an aryl or heteroaryl aldehyde in the presence of ammonia or an ammonia-releasing agent.