A B(C6F5)3H2O-catalyzed defluorinative functionalization of tertiary aliphaticfluorides is described that proceeds under benign reaction conditions. The synthetic utility of the method is exemplified through the fast and efficient formation of a range of products with newly installed C(sp3) N, S, C and O bonds. This study illustrates the broad reactivity of otherwise inert starting materials and provides
描述了在良性反应条件下进行的AB(C 6 F 5)3 H 2 O催化的叔脂肪族氟化物的脱氟官能化。通过快速有效地形成一系列具有新安装的C(sp 3)N,S,C和O键的产品,可以举例说明该方法的综合用途。这项研究说明了其他惰性原料的广泛反应性,并提供了通往有价值的和合成上代表性不足的产品的途径,这些产品以前从未从此类氟化前体中获得。
Cobalt-Catalyzed Cross-Coupling Reactions of Alkyl Halides with Allylic and Benzylic Grignard Reagents and Their Application to Tandem Radical Cyclization/Cross-Coupling Reactions
Details of cobalt-catalyzed cross-coupling reactions of alkyl halides with allylic Grignard reagents are disclosed. A combination of cobalt(II) chloride and 1,2-bis(diphenylphosphino)ethane (DPPE) or 1,3-bis(diphenylphosphino)propane (DPPP) is suitable as a precatalyst and allows secondary and tertiary alkyl halides--as well as primary ones--to be employed as coupling partners for allyl Grignard reagents
Treatment of alkyl halides, including tertiary alkyl bromides, with benzylic or allylic Grignard reagent in the presence of a catalytic amount of silver nitrate in ether yielded the corresponding cross-coupling products in high yields. The coupling reactions of tertiary alkyl halides provide efficient access to quaternary carbon centers.
Copper-Catalyzed Allylation of Alkyl Halides with Allylic Grignard Reagents
作者:Masahiro Sai、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/bcsj.82.1194
日期:2009.9.15
Treatment of alkyl halides, including secondary and tertiary alkyl bromides, with allylic Grignardreagents in the presence of a catalytic amount of copper(II) triflate in diisopropyl ether at 25°C yielded the corresponding allylated products in high yields. The coupling reactions of tertiary alkyl halides lead to construction of allylated quaternary carbon centers. The active species is likely to
在催化量的三氟甲磺酸铜 (II) 存在于二异丙醚中的情况下,在 25°C 下用烯丙基格氏试剂处理烷基卤化物,包括仲和叔烷基溴,以高产率得到相应的烯丙基化产物。叔烷基卤化物的偶联反应导致烯丙基化季碳中心的构建。活性物质可能是烯丙基铜酸盐。
Cobalt-Catalyzed Coupling Reaction of Alkyl Halides with Allylic Grignard Reagents