The Abnormal Behavior of an Atropisomer: 3,3′-Dibromo-1,1′-difluoro-2,2′-binaphthyl Reacting with Alkyllithium Compounds
作者:Frédéric Leroux、Giuseppe Mangano、Manfred Schlosser
DOI:10.1002/ejoc.200500514
日期:2005.12
isomer by deprotonation-triggered heavy halogen migration, was converted into 3,3'-dibromo-1,1'-difluoro-2,2'-binaphthyl (I) by consecutive treatment with lithium diisopropylamide, copper(II) bromide and nitrobenzene. The dilithiated intermediate generated from the atropisomer I by treatment with 2 equiv. of butyllithium reacted with a variety of electrophiles to afford products such as, diacid or bis(phosphane)
1-Fluoro-2-(triethylsilyl)naphthalene 和其他 1-fluoronaphthalene 衍生物。证明在 2 位带有抗金属化取代基的化合物对碱攻击是完全惰性的。3-Bromo-1-fluoronaphthalene,容易制备。通过去质子化引发的重卤素迁移,从 2-溴异构体转化为 3,3'-二溴-1,1'-二氟-2,2'-联萘 (I),通过连续用二异丙基氨基锂、铜 (II) 处理) 溴化物和硝基苯。通过用2当量处理从阻转异构体I产生的二锂化中间体。丁基锂与各种亲电试剂反应得到产物,例如二酸或双(磷烷)衍生物。. 高产。后者compd。也以直接的方式从(4-氟-2-萘基)二苯基氧化膦获得。没想到,3,3' -dibromobinaphthyl I 或其 3,3'-二碘类似物适用于单边但仅适用于双面卤素/金属置换。[在 SciFinder (R) 上]