Three-Component Reaction for the Convenient Synthesis of Functionalized 3-{1-[2-(1H-Indol-3-yl)ethyl]-4,5,6,7-tetrahydro-1H-indol-3-yl}indolin-2-ones
作者:Chao-Guo Yan、Yan-Hong Jiang
DOI:10.1055/s-0035-1561457
日期:——
efficient synthesis of functionalized 3-1-[2-(1H-indol-3-yl)ethyl]-4,5,6,7-tetrahydro-1H-indol-3-yl}indolin-2-ones in high yield via three-component reaction of tryptamine, dimedone, and 3-phenacylideneoxindoles in refluxing acetonitrile with p-toluenesulfonic acid as catalyst. A simple synthetic protocol was developed for the efficient synthesis of functionalized 3-1-[2-(1H-indol-3-yl)ethyl]-4,5,6
Synthesis of Dispirocyclopentyl-3,3′-bisoxindoles via Domino Cycloaddition Reactions of 4-Dimethylaminopyridinium Bromides with 3-Phenacylideneoxindoles
作者:Lijuan Lu、Chaoguo Yan
DOI:10.1002/cjoc.201500438
日期:2015.10
The base mediated cycloadditionreactions of 4‐dimethylamino‐1‐phenacylpyridinium bromides with two molecular 3‐phenacylideneoxindoles in methylene dichloride afforded functionalized dispirocyclopentyl‐3,3′‐bisoxindoles in good yields and with high diastereoselectivity. The similar cycloadditionreactions of 1‐(N,N‐dialkylcarbamoylmethyl) and 1‐cyanomethyl 4‐dimethylamino‐pyridinium bromide in refluxing
在二氯甲烷中由碱介导的4-二甲氨基-1-苯并吡啶鎓溴化物与两个分子3-苯并亚苄基吲哚的环加成反应提供了高收率和高非对映选择性的功能化二螺环戊基-3,3'-双氧吲哚。在三乙胺存在下,在回流的乙醇中,1-(N,N-二烷基氨基甲酰基甲基)和1-氰基甲基4-二甲基氨基-吡啶溴的类似的环加成反应也导致具有高非对映选择性的二螺环戊基-3,3'-双氧吲哚。基于1 H NMR数据和单晶结构,阐明了双螺环戊基3,3'-双恶吲哚的立体化学。
Synthesis of complex dispirocyclopentanebisoxindoles via cycloaddition reactions of 4-dimethylamino-1-alkoxycarbonylmethylpyridinium bromides with 2-oxoindolin-3-ylidene derivatives
作者:Li-Juan Lu、Qin Fu、Jing Sun、Chao-Guo Yan
DOI:10.1016/j.tet.2014.02.050
日期:2014.4
The cycloaddition reactions of 4-dimethylamino-1-alkoxycarbonylmethylpyridinium bromides with various 2-oxoindolin-3-ylidene derivatives in ethanol in the presence of triethylamine afforded the unprecedented dispirocyclopentanebisoxindole derivatives in good yields and in high diastereoselectivity. Under similar reaction conditions, the reactions of 1-alkoxycarbonylmethylpyridinium bromides with 3-phenacylideneoxindoles only resulted in 4-oxo-3-(2-oxoindolin-3-ylidene)-4-arylbutanoates. The stereochemistry of the complex spirooxindoles was established by H-1 NMR data and single crystal structures. (C) 2014 Elsevier Ltd. All rights reserved.
Highly diastereoselective synthesis of spiro[cyclopropane-1,3′-indolin]-2′-ones via catalyst-free cyclopropanation using ethyl diazoacetate
作者:Ram Awatar Maurya、Chada Narsimha Reddy、Geeta Sai Mani、Jeevak Sopanrao Kapure、Praveen Reddy Adiyala、Jagadeesh Babu Nanubolu、Kiran Kumar Singarapu、Ahmed Kamal
DOI:10.1016/j.tet.2014.05.065
日期:2014.8
Substituted 3-methyleneindolin-2-ones were efficiently cyclopropanated with ethyl diazoacetate to yield spiro[cyclopropane-1,3'-indolin]-2'-ones in a catalyst-free and highly diastereoselective reaction in a mixture of ethanol acetonitrile (1:1 v/v) as solvent. (C) 2014 Elsevier Ltd. All rights reserved.