Unusual Cleavage of the Enolsilane C-O Bond: Transformation of 2-Silyloxy-1,3-dienes into 1,3-Dienyl-2-zirconium Compounds and their Cross-Coupling Reactions
Aryl enolsilanes and 2-silyloxy-1,3-dienes react with zirconocene to give alkenylzirconium, and novel 1-methylene-2-propenylzirconium compounds which can be used as 2-dienylation reagents. Thus, one-pot coupling of 4-phenyl-1,3-butadienyl-2-zirconocene (2d) with a range of electrophiles including aryl, alkynyl, allyl halides, bromine, iodine and a Michael acceptor occurs regioselectively at the C-2 position in the presence of Pd or Cu catalysts.
芳基烯醇硅烷和2-甲硅烷氧基-1,3-二烯与二茂锆反应生成烯基锆,以及可用作2-二烯基化试剂的新型1-亚甲基-2-丙烯基锆化合物。因此,4-苯基-1,3-丁二烯基-2-二茂锆 (2d) 与一系列亲电子试剂(包括芳基、炔基、烯丙基卤化物、溴、碘和 Michael 受体)的一锅偶联在 C-2 上发生区域选择性在 Pd 或 Cu 催化剂存在下的位置。
Compounds And Compositions Containing Silicon And/Or Other Heteroatoms And/Or Metals And Methods of Making And Using Them
申请人:Welker Mark E.
公开号:US20100056801A1
公开(公告)日:2010-03-04
The present invention relates to compounds, intermediates, compositions, and methods of making compounds and intermediates related to the compounds of Formula (I) and/or Formula (II) and/or Formula (III) and/or Formula (IV) and/or Formula (VI) and/or Formula (VII) as disclosed herein wherein the various substituents are as defined in the written description.
作者:Partha P. Choudhury、Christopher S. Junker、Ramakrishna R. Pidaparthi、Mark E. Welker
DOI:10.1016/j.jorganchem.2013.12.046
日期:2014.3
A number of 2-silicon substituted 1,3-dienes have been prepared by one of three routes: 1) Reactions of 1,3-dienyl Grignard reagents with silyl electrophiles or silyl Grignard reagents with 1,3-dienyl electrophiles; 2) Hydrosilylation of enynes; 3) Enyne cross metathesis. The strengths and limitations of each preparative method are discussed. (C) 2013 Elsevier B. V. All rights reserved.
A Mild Synthesis of Vinyl Halides and <i>gem</i>-Dihalides Using Triphenyl Phosphite−Halogen-Based Reagents
作者:Alberto Spaggiari、Daniele Vaccari、Paolo Davoli、Giovanni Torre、Fabio Prati
DOI:10.1021/jo061346g
日期:2007.3.1
A new application of (PhO)(3)P-halogen-based reagents to the synthesis of vinyl halides and gem-dihalides is described. Vinyl halides were prepared in good to excellent yields from enolizable ketones, whereas aldehydes afforded the corresponding gem-dihalides. The halogenation proceeded smoothly under mild conditions.
Unexpected SN2′-type addition–elimination reactions of 1-aryl-2,3-allenols with LiX. Synthesis and synthetic application of 1-aryl-3-halo-1,3-dienes
作者:Shengming Ma、Guangwei Wang
DOI:10.1016/s0040-4039(02)01207-8
日期:2002.8
1-Aryl-3-halo-1,3-dienes were prepared from the sequential addition-elimination reaction of 1-aryl-2,3-allenols with LiX (X = Br, Cl) in HOAc in moderate to good yields. Here the aromatic substituent is crucial to this interesting transformation since no reaction was observed with 1-alkyl or perfluoroalkyl-2,3-allelols. The 1-aryl-3-halo-1,3-dienes prepared can be used as Useful partners in Diels-Alder reactions with dienophiles leading to polycyclic quinone derivatives, (C) 2002 Elsevier Science Ltd. All rights reserved.