A green and cost-effective method has been developed for the conversion of alkenes to ketones under metal-free conditions. The reaction involves the oxidative addtion of alkenes with aryl radicals, which are generated by visible-light induced aerobic oxidation of arylhydrazines. The key features of this reaction include broad substrate scope, readily available reagents and amenability to gram-scale
TiCl<sub>4</sub>-Catalyzed Indirect Anti-Markovnikov Hydration of Alkynes: Application to the Synthesis of Benzo[<i>b</i>]furans
作者:Lutz Ackermann、Ludwig T. Kaspar
DOI:10.1021/jo070887i
日期:2007.8.1
An efficient methodology for the indirect anti-Markovnikov hydration of unsymmetrically substituted terminal and internal alkynes is based on TiCl4-catalyzed hydroamination reactions. Its application to ortho-alkynylhaloarenes, followed by a copper-catalyzed O-arylation, provides flexible access to substituted benzo[b]furans.
一种不对称取代的末端和内部炔烃的间接反马氏水合的有效方法是基于TiCl 4催化的加氢胺化反应。其在邻炔基卤代芳烃上的应用,然后在铜催化的O-芳基化反应中,可以灵活地获得取代的苯并[ b ]呋喃。
Palladium-Catalyzed Carbonylative Synthesis of 2,3-Disubstituted Chromones
An unexpected palladium‐catalyzed carbonylative synthesis of 2,3‐disubstituted chromones has been developed. Starting from 2‐bromofluorobenzenes and ketones, the corresponding chromones were produced in good yields. By control experiments, this transformation was found to proceed through a sequential carbonylation/Claisen–Hasse rearrangement/intramolecular nucleophilic aromatic substitution approach
A One-pot Approach to Ethyl 1,4,5-Triaryl-1<i>H</i>-pyrazole-3-carboxylates via an Improved Claisen Condensation-Knorr Reaction Sequence
作者:Jiaojiao Zhai、Chunhui Gu、Jianan Jiang、Shunli Zhang、Daohua Liao、Lei Wang、Dunru Zhu、Yafei Ji
DOI:10.1002/cjoc.201300776
日期:2013.12
one‐pot approach to ethyl 1,4,5‐triaryl‐1H‐pyrazole‐3‐carboxylates has been developed in moderate to high yields. The tert‐BuOLi‐mediated Claisen condensation of 1,2‐diarylethanones and ethyl oxalyl chloride efficiently provided the enolized lithium salts of ethyl 2,4‐dioxo‐3,4‐diarylbutanoates, which in situ reacted with arylhydrazine hydrochlorides via a hydrochloric acid‐promoted Knorr reaction to produce
Catalytic mutual multicomponent reaction: facile access to α-trifluoromethylthiolated ketones
作者:Ming Yu Jin、Xiaodong Gu、Min Deng、Chuancheng Wang、Jun (Joelle) Wang
DOI:10.1039/d0cc04555a
日期:——
A multicomponent catalytic reaction between ketones, Morita–Baylis–Hillman (MBH) carbonates and trifluoromethylthiolating agents is devised for straightforwardly accessing two products, α-trifluoromethylthiolated ketones and α-methylene β-amino esters in a one pot fashion. Particularly noteworthy is that the trifluoromethylthiolating reagent is employed as both the nitrogen and SCF3 source initiated