Preparation of p-substituted tetrafluoropyridyl derivatives via the tetrafluoropyridylcopper reagent
作者:Ba Van Nguyen、Donald J. Burton
DOI:10.1016/j.jfluchem.2011.10.001
日期:2012.3
A new and improved preparation of 4-iodo-2,3,5,6-tetrafluoropyridine from pentafluoropyridine is described. This iodopyridine is utilized for the in situ preparation of the 4-tetrafluoropyridylcopper reagent, 1, via two methods. The firstmethod involves metathesis of the 4-tetrafluoropyridylcadmium reagent with Cu(I)Br at room temperature. The requisite cadmium reagent was readily prepared in situ
描述了从五氟吡啶制备4-碘-2,3,5,6-四氟吡啶的新的和改进的方法。这种碘吡啶被用于在原位制备的4- tetrafluoropyridylcopper试剂,的1,通过两种方法。第一种方法涉及在室温下将4-四氟吡啶基镉试剂与Cu(I)Br复分解。通过在室温下在DMF中4-碘四氟吡啶与酸洗过的镉粉末之间的反应可以很容易地就地制备必需的镉试剂。第二种方法涉及4-四氟吡啶基三丁基-四氟硼酸酯与Na 2 CO 3的原位反应。室温下在DMF中加入Cu(I)Br。1在室温下容易与烯丙基卤化物,乙烯基碘化物,芳基卤化物,酰氯和炔属碘化物进行反应,以立体定向地得到相应的4-四氟吡啶基衍生物。通过Pd(0)催化4-碘四氟吡啶与1-炔烃的反应,开发出了炔烃衍生物的替代途径。
Synthesis of 3,4-Disubstituted Isoquinolines via Palladium-Catalyzed Cross-Coupling of 2-(1-Alkynyl)benzaldimines and Organic Halides
作者:Guangxiu Dai、Richard C. Larock
DOI:10.1021/jo026294j
日期:2003.2.1
The palladium-catalyzed cross-coupling of readily available N-tert-butyl-2-(1-alkynyl)benzaldimines and aryl, allylic, benzylic, alkynyl halides, as well as a vinylic halide, provides a valuable new route to 3,4-disubstituted isoquinolines with aryl, allylic, benzylic, 1-alkynyl, and vinylic substituents, respectively, in the 4-position. The reaction appears to require an aryl group on the end of the
Synthesis of ethynylidene cyclopentanes by a cyclisation catalyzed by the simultaneous presence of palladium (0) and copper (I)
作者:Didier Bouyssi、Geneviève Balme、Jacques Gore
DOI:10.1016/0040-4039(91)80215-r
日期:1991.11
Ethynylidene cyclopentanes can be formed in 35–71% yield from the reaction of the enolates of compounds such as δ-acetylenic malonates with 1-halogeno-1-alkynes. This reaction requires catalysis by both palladium (0) and copper (I) species.
Reactions of Alkenes, Alkynes, and Alkoxyallenes with New Polymer-Supported Electrophilic Reagents
作者:Holger Monenschein、Georgia Sourkouni-Argirusi、Katherine M. Schubothe、Thomas O'Hare、Andreas Kirschning
DOI:10.1021/ol991149m
日期:1999.12.1
Preparation of new polymer-supported electrophilic reagents that efficiently promote 1,2-haloacetoxylations of alkenes and alkoxyallenes is described. Under very mild conditions and in high yields, alkenes are transformed into or-halo acetates while alkoxyallenes lead to vinyl iodides. In contrast to these results, terminal alkynes commonly afford synthetically valuable l-iodo-alkynes.
Cai, Mingzhong; Hao, Wenyan; Zhao, Hong, Journal of Chemical Research - Part S, 2003, # 8, p. 485 - 486