Traceless Rhodium-Catalyzed Hydroacylation Using Alkyl Aldehydes: The Enantioselective Synthesis of β-Aryl Ketones
作者:Anaïs Bouisseau、Ming Gao、Michael C. Willis
DOI:10.1002/chem.201604035
日期:2016.10.24
A one‐pot three‐step sequence involving Rh‐catalyzed alkene hydroacylation, sulfide elimination and Rh‐catalyzed aryl boronic acid conjugate addition gave products of traceless chelation‐controlled hydroacylation employing alkyl aldehydes. The stereodefined β‐aryl ketones were obtained in good yields with excellent control of enantioselectivity. Good variation of all three reaction components is possible
Intramolecular carbonyl-ene reactions in the synthesis of peri-oxygenated hydroaromatics
作者:Shyam Basak、Dipakranjan Mal
DOI:10.1016/j.tet.2016.02.033
日期:2016.4
Suzuki coupling of 2-formylphenylboronic acids, are shown to provide cycloalkylidene ene products under acidic conditions. Susceptibility of the products to aromatization is manoeuvred by varying the reaction conditions and catalysts including binol-derived Brønsted acid catalysts. A peri-effect is identified as a controlling factor for the aromatizations. Several oxidative transformations of an ene product
Photocatalytic intermolecular carboarylation of alkenes by selective C–O bond cleavage of diarylethers
作者:Meishan Ji、Chenyang Chang、Xinxin Wu、Chen Zhu
DOI:10.1039/d1cc04038c
日期:——
Disclosed herein is a novel radical-mediated intermolecular carboarylation of alkenes by cleaving inert C–O bonds. The strategically designed arylbenzothiazolylether diazonium salts are harnessed as dual-function reagents. A vast array of alkenes are proven to be suitable substrates. The benzothiazolyl moiety in the products serves as the formyl precursor, and the OH residue provides the cross-coupling
Catalytic Enantioselective Synthesis of Axially Chiral Diarylmethylidene Indanones
作者:Prashant Kumar、Rajendra P. Shirke、Sonu Yadav、S. S. V. Ramasastry
DOI:10.1021/acs.orglett.1c01671
日期:2021.6.18
triflates to access axially chiral (Z)-diarylmethylidene indanones (DAIs). The chemical, physical, and biological properties of DAIs are unknown, despite their being structurally similar to arylidene indanones, primarily due to the lack of racemic or chiral methods. Through this work, we demonstrate a general and efficient protocol for the racemic as well as the atropselective synthesis of (Z)-DAIs. An unusual
我们描述了 β-酮烯醇三氟甲磺酸酯的第一个 atropselective Suzuki-Miyaura 交叉偶联,以获取轴向手性 ( Z )-二芳基亚甲基茚满酮 (DAI)。尽管 DAI 在结构上与亚芳基茚满酮相似,但其化学、物理和生物学特性尚不清楚,这主要是由于缺乏外消旋或手性方法。通过这项工作,我们展示了 ( Z )-DAI的外消旋和 atropselective 合成的通用和有效的协议。一个不寻常的分子内 Morita-Baylis-Hillman 反应被用于 β-酮烯醇三氟甲磺酸酯的 Z 选择性合成。
Annulative Morita–Baylis–Hillman reaction to synthesise chiral dibenzocycloheptanes
作者:Atanu Mondal、Shivangi、Pinku Tung、Siddhant V. Wagulde、S. S. V. Ramasastry
DOI:10.1039/d1cc02765d
日期:——
We describe the first metal-free and organocatalytic strategy to accesshighlyfunctionalised dibenzocycloheptanes via a phosphine-promoted annulative Morita–Baylis–Hillman (MBH) reaction. The method is manipulated to access to chiral dibenzocycloheptanes as well. This work represents a rare entry for the construction of seven-membered carbocycles via the MBH route. The realisation of several bioactive