Construction of Chiral Tetrahydro-β-Carbolines: Asymmetric Pictet-Spengler Reaction of Indolyl Dihydropyridines
作者:Shou-Guo Wang、Zi-Lei Xia、Ren-Qi Xu、Xi-Jia Liu、Chao Zheng、Shu-Li You
DOI:10.1002/anie.201703178
日期:2017.6.19
A highly efficient synthesis of the enantioenriched tetrahydro-β-carbolines was developed by using a chiral phosphoric acid catalyzed Pictet–Spengler reaction of indolyl dihydropyridines. The reaction proceeds under mild reaction conditions to afford the desired chiral tetrahydro-β-carbolines in good to excellent yields (up to 96 %) and high enantioselectivities (up to 99 % ee). With this method, a
Synthesis of Bis(heteroaryl) Ketones by Removal of Benzylic CHR and CO Groups
作者:Arun Maji、Sujoy Rana、Akanksha、Debabrata Maiti
DOI:10.1002/anie.201308785
日期:2014.2.24
A copper‐catalyzed method for synthesis of diaryl ketones (Ar‐CO‐Ar′) through removal of benzylic ‐CH2‐, ‐CO‐, and ‐CHR‐ groups from Ar‐CO‐CXR‐Ar′ has been discovered. A number of symmetrical and unsymmetrical heterocyclic ketones, which are usually difficult to synthesize, can be prepared in good to excellent yields. This method was applied to the synthesis of the nonsteroidal anti‐inflammatory drug
发现了一种铜催化的方法,该方法通过从Ar-CO-CXR-Ar'中去除苄基-CH 2 -,-CO-和-CHR-基团来合成二芳基酮(Ar-CO-Ar')。可以以高至优异的产率制备通常难以合成的许多对称和不对称的杂环酮。该方法适用于非甾体类抗炎药Suprofen的合成(三步收率47%)。基于初步的力学和动力学研究,提出了一种活性Cu / O 2物种来介导重排反应。
Asymmetric Transfer Hydrogenation of Densely Functionalized Diheteroaryl and Diaryl Ketones by a Ru-Catalyst of Minimal Stereogenicity
functionalized diheteroaryl and diaryl ketones was developed using Ru-catalysts of minimal stereogenicity. Various ketone substrates with structurally and electronically similar groups attached to the prochiral centers were reduced successfully in good to excellent enantioselectivities and yields. This protocol provides practical and efficient access to chiral diheteroarylmethanols and benzhydrols,
Ligand-Free Pd-Catalyzed Carbonylative Cross-Coupling Reactions under Atmospheric Pressure of Carbon Monoxide: Synthesis of Aryl Ketones and Heteroaromatic Ketones
作者:Hongling Li、Min Yang、Yanxing Qi、Jijun Xue
DOI:10.1002/ejoc.201001685
日期:2011.5
The carbonylative Suzuki cross-coupling reactions of boronic acids with aryl iodides catalyzed by Pd 2 (dba) 3 as a ligand-free catalyst under atmospheric pressure of carbonmonoxide has been firstly developed. Under mild reaction conditions, a broad range of aryl/heteroaryl iodides and aryl/heteroaryl boronic acids were selectively coupled to afford the corresponding diaryl ketones in good to excellent
Synthesis of 2-heteroaryl-3-hydroxypyridines by ring expansion reactions of 2-acylfurans with ammonia
作者:Richard W. J. Chubb、Martin R. Bryce、Brian Tarbit
DOI:10.1039/b105228b
日期:——
A straightforward and versatile synthesis of 2-heteroaryl-3-hydroxypyridine derivatives is described by the one-step reaction of 2-acylfurans with ammonia at 150 °C.