Synthesis of Heterocyclic Allenes via Palladium-Catalyzed Hydride-Transfer Reaction of Propargylic Amines
作者:Hiroyuki Nakamura、Shinya Onagi、Takaya Kamakura
DOI:10.1021/jo0479664
日期:2005.3.1
propargyldiisopropylamine by the Sonogashira coupling reaction, underwent the allene transformation reaction in the presence of Pd2(dba)3·CHCl3 catalyst (2.5 mol %) and 1,2-bis[bis(pentafluorophenyl)phosphino]ethane (10 mol %) at 100 °C in CHCl3, giving the corresponding heterocyclic allenes in good to high yields via the palladium-catalyzed hydride-transfer reaction.
Highly chemoselective coupling of allenylstannanes with organic iodides promoted by Pd(PPh3)4/LiCl: an efficient method for the synthesis of substituted allenes
preparation of various monosubstituted arylallenes, disubstituted allenes and alkenylallenes via palladium-catalyzed coupling of allenylstannanes with aryliodides or alkenyl iodides is described. The coupling reaction was carried out in the presence of Pd(PPh3)4 and LiClusing DMF as solvent. The possible role of LiCl in this coupling process is discussed based on the 119Sn NMR studies.
描述了一种通过钯催化的烯丙基锡烷与芳基碘化物或烯基碘化物的偶联反应来制备各种单取代的芳基烯丙基,二取代的烯丙基和烯基烯丙基的有效方法。偶联反应是在Pd(PPh 3)4和LiCl的存在下,以DMF为溶剂进行的。基于119 Sn NMR研究,讨论了LiCl在该偶联过程中的可能作用。
Propargylic C(sp<sup>3</sup>)–H Bond Activation for Preparing η<sup>3</sup>-Propargyl/Allenyl Complexes of Yttrium
Propargylic C(sp3)—H bond activation of 1-substituted-1-propynes, such as 1-trimethylsilyl-1-propyne, 2-hexyne, and 1-phenyl-1-propyne, was achieved by treatment with an alkylyttrium complex 8 bearing an ene-diamido ligand to give the corresponding (η3-propargyl/allenyl)yttrium complexes 7a–c. A unique delocalized η3-propargyl/allenyl structure of these three complexes was revealed by NMR spectroscopy