Photoinduced Palladium-Catalyzed Carbofunctionalization of Conjugated Dienes Proceeding via Radical-Polar Crossover Scenario: 1,2-Aminoalkylation and Beyond
作者:Kelvin Pak Shing Cheung、Daria Kurandina、Tetsuji Yata、Vladimir Gevorgyan
DOI:10.1021/jacs.0c03993
日期:2020.6.3
A photoinduced palladium-catalyzed 1,2-carbofunctionalization of conjugateddienes has been developed. This mild modular approach, which does not require employment of exogeneous photosensitizers and external oxidants, allows for efficient and highly regio- and ste-reoselective synthesis of a broad range of allylic amines from readily available 1,3-dienes, alkyl iodides, and amines. Employment of O-
Synergistic Pd/Amine-Catalyzed Stereodivergent Hydroalkylation of 1,3-Dienes with Aldehydes: Reaction Development, Mechanism, and Stereochemical Origins
作者:Hongfa Wang、Ruiyuan Zhang、Qinglong Zhang、Weiwei Zi
DOI:10.1021/jacs.1c02220
日期:2021.7.28
that allowed us to achieve the first stereodivergent hydroalkylation reactions of 1,3-dienes with aldehydes. By choosing an appropriate combination of chiral palladium and amine catalysts, we could obtain either syn or anti coupling products, and this method therefore provides highly diastereo- and enantioselective access to complementary diastereomers of chiralaldehydes with α,β-vicinal stereocenters
The 4-arylisoindoles of the following formula are effective analgesics: ##STR1## including stereoisomers and pharmaceutically acceptable salts thereof, wherein ##STR2## with the proviso that there is 0 or 1 unsaturated bond in the isoindole ring and with the proviso that where the stereoisomer is: a) the 3a.beta., 4.beta., 7a.alpha. diastereomer, then a double bond joins the 5- and 6-position carbons or the 6- and 7-position carbons; b) the 3a.beta., 4.alpha., 7a.alpha. or the 3a.beta., 4.alpha., 7a.beta. diastereomers, then the double bond joins the 5- and 6-position carbons; and c) the 3a.beta., 4.beta., 7a.beta. diastereomer, then the double bond joins the 6- and 7-position carbons.
以下公式中的4-芳基异吲哚具有良好的止痛作用:##STR1## 包括立体异构体和其药学上可接受的盐,其中##STR2##条件是异吲哚环中有0或1个不饱和键,以及当立体异构体为:a) 3a.β.,4.β.,7a.α.对映异构体时,双键连接5-和6-位碳或6-和7-位碳; b) 3a.β.,4.α.,7a.α.或3a.β.,4.α.,7a.β.对映异构体时,双键连接5-和6-位碳; c) 3a.β.,4.β.,7a.β.对映异构体时,双键连接6-和7-位碳。
Nickel-Catalyzed Hydroalkynylation of 1,3-Dienes with Simple Alkynes
A hydroalkynylation reaction of 1,3-dienes with simplealkynes, facilitated by an efficient nickel catalyst system with the 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (Xantphos) ligand, is presented. This reaction displays a broad substrate range for alkynes, encompassing both aryl alkynes and alkyl alkynes, thereby overcoming previous constraints in 1,3-diene hydroalkynylation. The method offers
Photoinduced palladium-catalyzed 1,3-diene-selective fluoroalkylamination compounds as potential bactericidal agent against Xanthomonas oryzae pv. oryzae
作者:Yu Shi、Zhao-Sheng Zhang、Jiang Shao、Chen Fu、Lan-Tu Xiong、Zhao-Dong Li、Zi-Ning Cui
DOI:10.1016/j.cclet.2023.108794
日期:2024.1
A series of photoinduced palladium-catalyzed 1,3-diene-selective fluoroalkylamination derivatives was rationally synthesized based on diversity-oriented synthesis via cross coupling of 1,3-dienes, amines and fluoroalkyliodides. The reaction featured good function group tolerance and a broad substrate scope, which could be extended to the late-stage modification of bioactive molecules. Bactericidal