Activation of C–O and C–N Bonds in Allylic Alcohols and Amines by Palladium Complexes Promoted by CO<sub>2</sub>. Synthetic Applications to Allylation of Nucleophiles, Carbonylation, and Allylamine Disproportionation
作者:Masato Sakamoto、Isao Shimizu、Akio Yamamoto
DOI:10.1246/bcsj.69.1065
日期:1996.4
can be achieved by using allylicalcohols directly in the presence of palladium complexes and CO2. Direct carbonylation of allylicalcohols into unsaturated carboxylic acids can be catalyzed by palladium complexes under the pressure of CO and CO2. Disproportionation of diallylamine into triallylamine and allylamine is also catalyzed by palladium complexes in the presence of CO2. On the basis of studies
通过在 CO2 下进行反应,钯配合物催化的烯丙醇中 C-O 键的直接活化得到了加速。与二乙胺反应,在常压二氧化碳和常压下,在钯配合物存在下,烯丙醇可转化为N,N-二乙基烯丙胺。在钯配合物和 CO2 存在下,直接使用烯丙醇可以实现各种碳亲核试剂的烯丙基化,例如 β-酮酯和 β-二酮。在CO和CO2的压力下,钯配合物可以催化烯丙醇直接羰基化为不饱和羧酸。二烯丙胺歧化成三烯丙胺和烯丙胺也在 CO2 存在下由钯配合物催化。
Organophosphorus-Catalyzed Borylative Ring-Opening of Vinylcyclopropanes: A Stereoselective Route to δ-Valerolactones
through an organophosphorus-catalyzed borylative ring-opening/allylation of vinylcyclopropanes providing δ-hydroxy estersstereoselectively. The δ-hydroxy esters were lactonized to obtain densely substituted δ-valerolactones. The present methodology exhibited enhanced functional group tolerance compared to the existing metal-mediated methods. A plausible mechanism for borylative ring-opening reaction
我们通过有机磷催化的乙烯基环丙烷的硼基化开环/烯丙基化立体选择性地提供 δ-羟基酯,报告了一种操作简单的 δ-戊内酯途径。δ-羟基酯被内酯化以获得密集取代的δ-戊内酯。与现有的金属介导方法相比,本方法表现出增强的官能团耐受性。已经提出了一种可能的硼酸化开环反应机制。31 P NMR 研究表明磷鎓两性离子种类的参与。证明了中间体硼酸烯丙酯的合成效用。
Palladium-catalyzed intramolecular cyclization of vinyloxirane regioselective formation of cyclobutanol derivative
作者:Martine Zucco、Franck Le Bideau、Max Malacria
DOI:10.1016/0040-4039(95)00290-s
日期:1995.4
Vinyloxirane 1 in the presence of catalytic amount of palladium complexes led smoothly and very regioselectively to cyclobutane derivatives as a 4 to 1 mixture of diastercomers.
Divergent Titanium‐Mediated Allylations with Modulation by Nickel or Palladium
作者:Araceli G. Campaña、Btissam Bazdi、Noelia Fuentes、Rafael Robles、Juan M. Cuerva、J. Enrique Oltra、Susana Porcel、Antonio M. Echavarren
DOI:10.1002/anie.200802520
日期:2008.9.15
Enantioselective Iridium-Catalyzed
Allylic Aminations of Allylic Carbonates with Functionalized Side
Chains. Asymmetric Total Synthesis of (<i>S</i>)-Vigabatrin
Iridium-catalyzedaminations of allylic carbonates containing a variety of O-functional groups have been explored. High degrees of regio- as well as enantioselectivity were achieved with diacylamides under salt-free conditions and with arylamines. The results allowed the antiepilepsy drug (S)-vigabatrin to be prepared via a very short route.