A new rapid multicomponent domino heteroannulation of heterocyclic keteneaminals: solvent-free regioselective synthesis of functionalized benzo[g]imidazo[1,2-a]quinolinediones
作者:Li-Rong Wen、Qi-Chang Sun、Hai-Liang Zhang、Ming Li
DOI:10.1039/c2ob27137k
日期:——
A highly efficient and straightforward three-component cascadereaction was developed to synthesize benzo[g]imidazo[1,2-a]quinolinedione derivatives from heterocyclic ketene aminals (HKAs), aldehydes, and 2-hydroxy-1,4-naphthoquinone (HNQ) via Et3N-catalyzed tandem [3 + 2 + 1] annulationundersolvent-freeconditions. The reactions were very mild, convenient and highly regioselective to form new fused
开发了一种高效,简单的三组分级联反应,以从杂环中合成苯并[ g ]咪唑并[1,2- a ]喹啉二酮衍生物烯酮 缩醛(HKA),醛和 2-羟基-1,4-萘醌(HNQ)通过Et 3 N催化的串联[3 + 2 +1]在无溶剂条件下进行环化。反应非常温和,方便并且具有高度区域选择性,以形成新的稠合四环靶分子。
Chemistry of Heterocyclic Ketene Aminals: Construction of Imidazo(pyrido)[1,2-<i>a</i>]pyridines and Imidazo(pyrido)[3,2,1-<i>ij</i>][1,8]naphthyridines via DABCO-Catalyzed Tandem Annulations
2-(2-Chloroaroyl)methyleneimidazolidines with four reactive sites show fascinating structural features and could be used as a new strategy for the synthesis of novel heterocycles. This paper presents our new findings in the reaction of 2-(2-chloroaroyl)methyleneimidazolidines with allenic esters affording functionalized imidazo(pyrido)[1,2-a]pyridines via DABCO-catalyzed tandem annulations. Of particular
具有四个反应位点的2-(2-氯代芳酰基)亚甲基咪唑烷显示出令人着迷的结构特征,可以用作合成新杂环的新策略。本文介绍了我们的新发现,在2-(2-氯芳酰基)亚甲基咪唑烷与烯丙酸酯的反应中,通过DABCO催化串联环合提供官能化的咪唑并(吡啶基)[1,2- a ]吡啶。特别重要的是掺入ø卤代组成的2-benzoylmethylene-咪唑烷芳基环,以建立一个方便的和一般的方式用于构造不寻常的咪唑并(吡啶基)[3,2,1 IJ ] [1,8萘啶。
Solvent-free and efficient synthesis of imidazo[1,2-a]pyridine derivatives via a one-pot three-component reaction
作者:Li-Rong Wen、Zhao-Rui Li、Ming Li、Han Cao
DOI:10.1039/c2gc16388h
日期:——
regioselective synthesis of imidazo[1,2-a]pyridinederivatives has been developed by annulation of heterocyclic ketene aminals (HKAs) and β-oxodithioesters (ODEs) as building blocks with aldehydes under solvent-free conditions using Et3N as the catalyst. The present green synthesis shows fascinating properties such as high regioselectivity, concise one-pot methodology, short reaction times, easy purification
通过杂环杂环化开发了一种绿色高效的咪唑并[1,2- a ]吡啶衍生物的区域选择性合成方法烯酮 阿米那犬 (HKAs)和β-氧二硫代酯(ODE)作为构建基, 醛类 在下面 溶剂-Et 3 N作为自由条件催化剂。目前的绿色合成显示出令人着迷的特性,例如高区域选择性,简洁的一锅法,反应时间短,易于操作纯化并且避免使用过渡金属。该方法学提供了另一种方法,可轻松以高收率轻松获得高度取代的咪唑并[1,2- a ]吡啶。