Catalytic Nucleophilic Allylation Driven by the Water–Gas Shift Reaction
作者:Scott E. Denmark、Zachery D. Matesich、Son T. Nguyen、Selena Milicevic Sephton
DOI:10.1021/acs.joc.7b02658
日期:2018.1.5
of this reactionfrom the initial serendipitous discovery to its general synthetic scope is detailed, highlighting the roles of water, CO, and amine in the generation of a more complete catalytic cycle. The use of unsymmetrical allylic pro-nucleophiles was shown to give preferential product formation through the modulation of reaction conditions. Both (E)-cinnamyl acetate and vinyl oxirane were efficiently
钌与烯丙基亲核试剂的醛催化烯丙基化已被证明是在温和条件下形成碳-碳键的有效方法。此反应从最初的偶然发现到其一般合成范围的演变过程都进行了详细介绍,突出了水,一氧化碳和胺在更完整的催化循环生成中的作用。结果表明,使用不对称的烯丙基亲核亲核试剂可以通过调节反应条件来优先形成产物。(E)-肉桂酸乙酸酯和乙烯基环氧乙烷均有效地用于形成抗支链产物(抗/ syn最高> 20:1 )和E-线性产物(最高> 20:1 E / s )Z)分别与芳香族,α,β-不饱和和脂肪族醛形成高选择性。强调了使反应对映选择性的尝试,包括对苯甲醛高达75:25的对映富集。
Tandem Application of C–C Bond-Forming Reactions with Reductive Ozonolysis
作者:Rachel Willand-Charnley、Patrick H. Dussault
DOI:10.1021/jo3015775
日期:2013.1.4
Several variants of reductiveozonolysis, defined here as the in situ generation of aldehydes or ketones during ozonolytic cleavage of alkenes, are demonstrated to work effectively in tandem with a number of C–C bond-forming reactions. For reactions involving basic nucleophiles (1,2-addition of Grignard reagents, Wittig or Horner–Emmons olefinations, and directed aldol reactions of lithium enolates)
One-Pot Synthesis of Indole-3-acetic Acid Derivatives through the Cascade Tsuji–Trost Reaction and Heck Coupling
作者:Dongsheng Chen、Yuanyuan Chen、Zhilong Ma、Lei Zou、Jianqi Li、Yu Liu
DOI:10.1021/acs.joc.8b01056
日期:2018.6.15
palladium-mediated cascade Tsuji–Trost reaction/Heck coupling of N-Ts o-bromoanilines with 4-acetoxy-2-butenonic acidderivatives using a Pd(OAc)2/P(o-tol)3/DIPEA system is described for a straightforward synthesis of indole-3-acetic acidderivatives. This methodology was successfully applied to synthesize various substituted indole/azaindole-3-acetic acidderivatives and Almotriptan, which is a drug for the acute
Enantioselective Construction of All-Carbon Quaternary Stereocenters Using Palladium-Catalyzed Asymmetric Allylic Alkylation of γ-Acetoxy-α,β-unsaturated Carbonyl Compounds
β-unsaturated carbonyl compounds are useful starting materials for Pd-catalyzed asymmetricallylicalkylation to construct all-carbon quaternary stereocenters. With the use of 2–5 mol % of Pd catalyst and 4–10 mol % of P-chirogenic diaminophosphine oxides, asymmetricallylicalkylation of γ-acetoxy-α,β-unsaturated carbonyl compounds with various prochiral nucleophiles derived from cyclic β-keto esters proceeded
We developed an efficient method for the synthesis of 3-substituted 2,3-dihydroquinolin-4-ones using a one-pot sequential multi-catalytic process: Pd-catalyzed allylic amination–thiazolium salt-catalyzed Stetter reaction cascade. Measurement of the initial rate of the developed sequential process revealed a significant increase in the reaction rate of the Stetter reaction in the presence of Pd(OAc)2
我们开发了一种有效的方法,该方法使用一锅顺序多催化方法合成3-取代的2,3-二氢喹啉-4-酮:Pd催化的烯丙基胺化-噻唑盐催化的Stetter反应级联反应。对已发展的连续过程的初始速率的测量表明,在存在Pd(OAc)2和AcOH· i -Pr 2 NEt(第一种Pd催化的组成部分)的情况下,Stetter反应的反应速率显着提高。