Synthesis of β-fluoroenones and their reductive rearrangement in aqueous media
摘要:
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.
Iodine-Initiated Domino Reaction of Hepta-1,2-dien-6-yn-4-ols and Brønsted Acid Promoted Cyclization of Hepta-1,2,6-trien-4-ols Leading to Functionalized Benzenes
作者:Yan He、Xin-Ying Zhang、Liang-Yan Cui、Xue-Sen Fan
DOI:10.1002/asia.201201151
日期:2013.4
carbonyl groups, along with the construction of the benzenoid core, has been achieved through an iodine‐initiated dominoreaction of hepta‐1,2‐dien‐6‐yn‐4‐ols. Moreover, cyclization of hepta‐1,2,6‐trien‐4‐ols turns out to also be an efficient pathway toward diversely substituted benzenes.
Tunable Synthesis of Functionalized Cyclohexa-1,3-dienes and 2-Aminobenzophenones/Benzoate from the Cascade Reactions of Allenic Ketones/Allenoate with Amines and Enones
作者:Tian Feng、Miaomiao Tian、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.8b00473
日期:2018.5.4
TEMPO-dependent tunable synthesis of functionalized cyclohexa-1,3-dienes and 2-aminobenzophenones/benzoate from the one-pot cascade reactions of allenic ketones/allenoate with amines and enones is presented. Mechanistically, the construction of the entitled six-membered carbocycles involves the in situ generation of an enaminone intermediate via the conjugate addition of allenic ketone with amine followed
Synthesis of cyclopentenyl and cyclohexenyl ketones via [3+2] and [4+2] annulations of 1,2-allenic ketones
作者:Liang-Yan Cui、Sheng-Hai Guo、Bin Li、Xin-Ying Zhang、Xue-Sen Fan
DOI:10.1016/j.cclet.2013.10.008
日期:2014.1
Abstract In this paper, an efficient synthesis of cyclopentenyl ketones and cyclohexenyl ketones through tertiary phosphinecatalyzed [3 + 2] and [4 + 2] annulations of 1,2-allenic ketones with activated alkenes has been developed. Compared with published synthetic methods on cyclopentenyl ketones and cyclohexenyl ketones, the protocols developed in this paper have the advantages such as readily available
Tandem reaction of 3-hydroxyhexa-4,5-allenic esters: a novel access to diversely substituted 2H-pyran-2-ones and indenes
作者:Haiyun Xu、Xinying Zhang、Yan He、Shenghai Guo、Xuesen Fan
DOI:10.1039/c2cc30247k
日期:——
A highly efficient synthesis of diversely substituted 2H-pyran-2-ones and indenes through Brønsted acid promoted tandem reaction of the readily obtainable 3-hydroxyhexa-4,5-allenic esters under extremely mild conditions has been developed.