A Sequential Acyl Thiol–Ene and Thiolactonization Approach for the Synthesis of δ-Thiolactones
作者:Ruairí O. McCourt、Eoin M. Scanlan
DOI:10.1021/acs.orglett.9b01271
日期:2019.5.3
A novel strategy for the synthesis of δ-thiolactones from inexpensive and readily available γ-unsaturated esters has been developed. This strategy incorporates a radical acyl thiol–ene reaction as the key C–S bond forming step. Cyclization is achieved via a Steglich-type thiolactonization of 5-mercaptopentanoic acids. We report the facile and scalable synthesis of δ-thiolactones in moderate to good
Complex Polyheterocycles and the Stereochemical Reassignment of Pileamartine A via Aza-Heck Triggered Aryl C–H Functionalization Cascades
作者:Benjamin T. Jones、Javier García-Cárceles、Lewis Caiger、Ian R. Hazelden、Richard J. Lewis、Thomas Langer、John F. Bower
DOI:10.1021/jacs.1c08615
日期:2021.9.29
N-polyheterocycles can be accessed via intramolecular Pd(0)-catalyzed alkene 1,2-aminoarylation reactions. The method uses N-(pentafluorobenzoyloxy)carbamates as the initiating motif, and this allows aza-Heck-type alkene amino-palladation in advance of C–H palladation of the aromatic component. The chemistry is showcased in the first total synthesis of the complex alkaloid (+)-pileamartine A, which has resulted in
Atmospheric Oxygen Mediated Radical Hydrothiolation of Alkenes
作者:Ruairí O. McCourt、Eoin M. Scanlan
DOI:10.1002/chem.202002542
日期:2020.12.4
hydrothiolation of alkenes (and alkyne) is reported. A variety of sulfur containing motifs including alkanethiols, thiophenols and thioacids undergo an atmospheric oxygen‐mediated radical hydrothiolation reaction with a plethora of alkenes in good yield with excellent functional group compatibility, typically with short reaction times to furnish a range of functionalized products. Biomolecules proved
Combined Oxypalladation/CH Functionalization: Palladium(II)-Catalyzed Intramolecular Oxidative Oxyarylation of Hydroxyalkenes
作者:Rong Zhu、Stephen L. Buchwald
DOI:10.1002/anie.201108129
日期:2012.2.20
An efficient protocol has been developed for the intramolecularoxidativeoxyarylation using a PdII‐catalyzed tandem oxypalladation/CHfunctionalization strategy. This methodology allows rapid access to tetrahydro‐2H‐indeno‐[2,1‐b]furan frameworks from simple hydroxyalkenes. The reactivity of this process is orthogonal to that of Pd0‐catalyzed transformations, enabling the divergent modification of
使用 Pd II催化的串联氧钯化/C H 功能化策略开发了一种有效的分子内氧化氧基化方案。该方法允许从简单的羟基烯烃快速获得四氢-2H-茚并- [2,1- b ]呋喃骨架。该过程的反应性与 Pd 0催化转化的反应性正交,从而能够对单个分子进行不同的修饰。
Pd(II)-Catalyzed Intramolecular Amidoarylation of Alkenes with Molecular Oxygen as Sole Oxidant
作者:Kai-Tai Yip、Dan Yang
DOI:10.1021/ol2006083
日期:2011.4.15
Stereoselective palladium-catalyzed synthesis of structurally versatile indoline derivatives, using molecular oxygen as the sole oxidant, is described. New C-N and C-C bonds form across an alkene in an intramolecular manner. The C-N bond-forming step proceeds via a syn-amidopalladation pathway. The moderate kinetic isotope effects (intramolecular KIE = 3.56) suggest that electrophilic aromatic substitution occurs in the arylation step.