An efficientsynthesis of substituted indolizine and its benzo derivatives, pyrrolo[1,2-a]quinolines and pyrrolo[2,1-a]isoquinolines, by the reaction of allenyl ketones with α-bromo carbonyl compounds and pyridines (quinoline or isoquinoline) under mild conditions without an added oxidant other than molecular oxygen from air was developed. Notably, allenyl ketones with or without a substituent attached
Tandem Reactions of 1,2-Allenic Ketones Leading to Substituted Benzenes and α,β-Unsaturated Nitriles
作者:Xinying Zhang、Xuefei Jia、Liangliang Fang、Nan Liu、Jianji Wang、Xuesen Fan
DOI:10.1021/ol201789z
日期:2011.10.7
One-pot double Michaeladdition/intramolecular aldol reaction/decarboxylation of 1,2-allenic ketones with cyanoacetate offers an efficient and convenient approach to highly functionalized benzenes. With 2-substituted cyanoacetates, the reaction proceeds via a different tandem process to afford α,β-unsaturatednitriles effectively.
Synthesis of 2-Vinylbenzofurans via the Copper-Catalyzed Multicomponent Reactions Involving an Oxa-Michael/Arylation/Vinylation Cascade
作者:Jie-Ping Wan、Hang Wang、Yunyun Liu、Hanfeng Ding
DOI:10.1021/ol502506g
日期:2014.10.3
2-vinylbenzofurans have been synthesized via the copper catalyzed. one-pot, three component reactions of o-iodophenols in situ generated allenes, and dichloromethane Cascade transformation of oxa-Michael addition C-arylation, and sp(3)C-H/sp(3)C-Cl conversion-based vinylation has been involved in realizing the construction of this 2-vinylbenzofuran framework.
Synthesis of β-fluoroenones and their reductive rearrangement in aqueous media
作者:Yan He、Nana Shen、Xuesen Fan、Xinying Zhang
DOI:10.1016/j.tet.2013.07.065
日期:2013.10
In this paper, a simple and efficient preparation of beta-fluoroenones, as a mixture of E/Z isomers with the E-isomer as the main product, from 1,2-allenic ketones by using TBAF center dot 3H(2)O in water as a nucleophilic fluorination agent has been developed. Moreover, in exploring the synthetic applications of b-fluoroenones, an unprecedented reductive defluorination rearrangement of beta-fluoroenones toward enones under mild conditions in aqueous media was also discovered. (C) 2013 Elsevier Ltd. All rights reserved.