A new type of ketene dithioacetal, 2-(3,3-bis-methylsulfanyl-1-arylallylidene)malononitriles containing 1,4 and 1,6-Michael acceptors, were synthesized to study their reactivity for the synthesis of a new molecular entity. We report a [5 + 1] annulation strategy for the construction of multifunctional biaryls and p-teraryls by the selection of a suitable nucleophilic source. The reaction of p-nitrotoluene
[EN] METHODS OF MAKING 2-HALONICOTINONITRILES<br/>[FR] PROCÉDÉS DE PRODUCTION DE 2-HALONICOTINONITRILES
申请人:MCQUADE D TYLER
公开号:WO2015031718A1
公开(公告)日:2015-03-05
A method of making a 2-halonicotinonitrile comprises reacting an alkylidene nitrile with a C1-compound in an organic solvent and a dehydrating agent. The dehydrating agent substantially retards dimerization of the alkylidene nitrile during the reaction. The enamine intermediate that forms from the reaction is cyclized using a halide donor to make the 2-halonicotinonitrile.
Phosphine-Catalyzed Annulations between Modified Allylic Derivatives and Polar Dienes and Substituent Effect on the Annulation Mode
作者:Junjun Tian、Haiyun Sun、Rong Zhou、Zhengjie He
DOI:10.1002/cjoc.201300646
日期:2013.10
In this work, the phosphine‐catalyzed annulationreactions between modifiedallylic derivatives and polar 1,1‐dicyano‐1,3‐dienes have been studied. In the catalysis of PPh3 (20 mol%), a [4+1] annulationreaction is realized between a series of 1,1‐dicyano‐2,4‐diaryl‐1,3‐dienes and ethoxycarbonyl‐activatedallylic acetate, producing polysubstituted cyclopentenes in modest to excellent yields. It is
[4 + 2] Annulation of 3-Nitroindoles with Alkylidene Malononitriles: Entry to Substituted Carbazol-4-amine Derivatives
作者:Dongdong Cao、Anguo Ying、Hanjie Mo、Dingben Chen、Gang Chen、Zhiming Wang、Jianguo Yang
DOI:10.1021/acs.joc.8b01876
日期:2018.10.19
and transition-metal-free method for the construction of the carbazol-4-amine motif via a vinylogous Michael addition/cyclization/isomerization/elimination reaction of 3-nitroindoles with alkylidenemalononitriles has been developed. This novel methodology allows the facile synthesis of a series of di- and trisubstituted carbazol-4-amine derivatives in moderate to good yields. A gram-scale experiment