Hydroalkylation leading to heterocyclic compounds. Part 1: New strategies for the synthesis of polysubstituted 2H-pyran-2-ones
作者:Wei-Bing Liu、Huan-Feng Jiang、Chun-Li Qiao
DOI:10.1016/j.tet.2008.12.069
日期:2009.3
Polysubstituted 2H-pyran-2-ones and 5,6-dihydro-2H-pyran-2-ones were synthesized via the MCRs initiated by the hydroalkylation of alkynoates with activated methylenes. Under the optimized reaction conditions, the desired products were obtained in 47–88% isolated yields. The experimental results showed that the groups on activated methylenes act important roles in the nucleophilic attack fashion.
Synthesis of Polysubstituted α-Pyrones Using Zinc-Catalyzed Addition-Cyclization Reactions
作者:Wei-Bing Liu、Cui Chen、Qing Zhang、Zhi-Bo Zhu
DOI:10.1002/jhet.1698
日期:2014.9
Various polysubstituted α‐pyrone derivatives have been directly synthesized via a hydroalkylation of Michael additional reaction following a cyclized process catalyzed by the Lewis acid of Zn(OAc)2. This protocol provides a new convenient and step‐economical route to construct heterocycles. Fourteen examples are obtained from easily available materials with moderate to good yields.
Synthese von 2(1<i>H</i>)-Pyridonen aus 2<i>H</i>-Pyran-2-onen
作者:Vratislav Kvita
DOI:10.1055/s-1991-26600
日期:——
Synthesis of 2(1H)-Pyridones From 2H-Pyran-2-ones 5-Substituted and 4,5-disubstituted 2(1H)-pyridones (13 examples) with formyl, acyl, alkoxycarbonyl, and trifluoromethyl groups in the 5 position were prepared in 16-97% yield by amination of the corresponding 2H-pyran-2-ones with hexamethyldisilazane or alkyl(trimethylsilyl)amines.
Über die Reaktion einiger 2<i>H</i>-Pyran-2-on-Derivate mit primären Aminen
作者:Vratislav Kvita、Hanspeter Sauter、Grety Rihs
DOI:10.1002/hlca.19910740218
日期:1991.3.13
On the Reaction of Some 2H-Pyran-2-one Derivatives with Primary Amines
关于一些2 H -Pyran-2-one衍生物与伯胺的反应
Construction of Functionalized 2<i>H</i>-Pyran-2-ones via N-Heterocyclic Carbene-Catalyzed [3 + 3] Annulation of Alkynyl Esters with Enolizable Ketones
作者:Zheng Liang、Jibin Li、Lei Wang、Zexuan Wei、Jiahui Huang、Xinrui Wang、Ding Du
DOI:10.1021/acs.joc.2c02392
日期:2023.2.3
A new synthesis of functionalized 2H-pyran-2-ones has been developed through N-heterocyclic carbene-catalyzed formal [3 + 3] annulation of alkynyl esters with enolizable ketones. The key to the success of this protocol relies on the use of an NHC instead of a tertiaryamine as the catalyst. This protocol also features a broad substrate scope and mildmetal-free conditions, offering simple and rapid