An improved, efficient route to 2,2-difluoroethenylbenzenes
摘要:
Treatment of vinylidene fluoride with tert-BuLi at - 115 degrees C gave a solution of [F2C=CHLi]. Addition of Bu3SnCl to this lithium reagent at - 110 degrees C gave an 88% isolated yield of F2C=CHSnBu3. Reaction of F2C=CHSnBu3 with substituted aryl iodides under Stille-Liebeskind conditions [Pd(PPh3)(4)/Cu(I)I] at room temperature afforded the 2,2-difluoroethenylbenzines in good yield. In the absence of the Cu(I)I co-catalyst, no reaction occurred. This work provides the most efficient route for the conversion of aryl halides to 2,2-difluorostyrenes. (C) 2011 Elsevier B.V. All rights reserved.
Palladium-catalyzed chemistry of .beta.-lactam vinyl triflates: coupling with organostannanes and alkoxycarbonylation
作者:Gwendolyn K. Cook、William J. Hornback、Chris L. Jordan、John H. McDonald、John E. Munroe
DOI:10.1021/jo00285a037
日期:1989.11
An improved, efficient route to 2,2-difluoroethenylbenzenes
作者:Long Lu、Donald J. Burton
DOI:10.1016/j.jfluchem.2011.06.005
日期:2012.1
Treatment of vinylidene fluoride with tert-BuLi at - 115 degrees C gave a solution of [F2C=CHLi]. Addition of Bu3SnCl to this lithium reagent at - 110 degrees C gave an 88% isolated yield of F2C=CHSnBu3. Reaction of F2C=CHSnBu3 with substituted aryl iodides under Stille-Liebeskind conditions [Pd(PPh3)(4)/Cu(I)I] at room temperature afforded the 2,2-difluoroethenylbenzines in good yield. In the absence of the Cu(I)I co-catalyst, no reaction occurred. This work provides the most efficient route for the conversion of aryl halides to 2,2-difluorostyrenes. (C) 2011 Elsevier B.V. All rights reserved.