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。
Palladium-catalyzed functionalization of indoles with 2-acetoxymethyl substituted electron-deficient alkenes
作者:Shengming Ma、Shichao Yu
DOI:10.1016/j.tetlet.2004.08.178
日期:2004.11
A new functionalization of indoles via palladium-catalyzed reaction of indoles and 2-acetoxymethyl substituted electron-deficientalkenes is reported. The reaction was carried out under neutral condition and no isomerization of the carbon–carbon double bond was observed.
Pd-Catalyzed Cascade Reactions of Aziridines: One-Step Access to Complex Tetracyclic Amines
作者:Jonathan P. Knowles、Hannah G. Steeds、Maria Schwarz、Francesca Latter、Kevin I. Booker-Milburn
DOI:10.1021/acs.orglett.1c01403
日期:2021.7.2
cycloaddition is shown to transform tricyclicaziridines into complex, stereodefined tetracyclic products in a single step. This highly unusual cascade process involves a diverted Tsuji–Trost sequence leading to a surprisingly facile intramolecular Diels–Alder reaction. The starting materials are accessible on multigram scales from the photochemical rearrangement of simple pyrroles. The tetracyclic amine products
Stereoselective Synthesis of Medium-Sized Cyclic Compounds by Means of Tandem Reactions of a Cyclic Oxosulfonium Ylide with Acetates of Baylis−Hillman Adducts
five-membered cyclic oxosulfonium ylide 3 with β-acetoxy-α-methylene ketones in the presence of two equimolar amounts of base afforded the cycloheptene oxide derivatives 7a−i as single stereoisomers in 19−77% yields. The products were considered to form through a Michael-type addition of the ylide, followed by elimination of the acetoxy group and an intramolecular Corey−Chaykovsky reaction. On the
Palladium-Catalyzed Functionalization of Indoles with 2-Acetoxymethyl-Substituted Electron-Deficient Alkenes
作者:Shengming Ma、Shichao Yu、Zhihua Peng、Hao Guo
DOI:10.1021/jo061546s
日期:2006.12.1
New functionalizations of indoles via palladium-catalyzed reaction of indoles and 2-acetoxymethyl-substituted electron-deficient alkenes are reported. It was found that for N-protected indoles the reaction proceeded smoothly in the presence of 5 mol % of Pd(acac)(2) and 10 mol % of PPh3 at 80 degrees C in HOAc, while for N-unprotected indoles, the reaction was carried out by using 5 mol % of Pd(dba)(2) or 2.5 mol % of Pd-2(dba)(3), CHCl3 with 10 mol % of 2,2'-bipyridine as the catalyst in toluene. This strategy allows the selective installation of electron-deficient olefin functionality at the 3-position of indoles, which might be difficult to obtain by other methods and can be further elaborated.