多米诺Knoevenagal分子内杂种Diels可快速获得吲哚[2,1- a ]吡咯并[4',3':4,5]吡喃并[5,6- c ]香豆素/ [6,5- c ]色酮衍生物der木反应
摘要:
含有内部亲双烯体的吲哚-2-甲醛与香豆素的Knoevenagal缩合反应,然后发生多米诺骨牌分子内杂Diels-Alder反应,形成多环杂环。吲哚[2,1- a ]吡咯[4',3':4,5]吡喃[5,6- c ]香豆素和吲哚[2,1- a ]吡咯[4]的立体和化学选择性合成的不同方法描述了′,3′:4,5]吡喃并[6,5- c ]色酮衍生物。
Facile Synthesis of 3-Halobenzo-heterocyclic-2-carbonyl Compounds<i>via</i>in situ Halogenation-Oxidation
作者:Xiaojian Jiang、Junjie Yang、Feng Zhang、Pei Yu、Peng Yi、Yewei Sun、Yuqiang Wang
DOI:10.1002/adsc.201600431
日期:2016.8.18
A facile method to synthesize 3‐halobenzo‐heterocyclic‐2‐carbonylcompounds is described. Mechanistic studies suggested that a halo‐cyclization process, which generated the unstable spiro‐acetal transition state and readily convertible to the corresponding carbonylcompound might be involved. Diverse 3‐halobenzo‐heterocyclic‐2‐carbonylcompounds could be synthesized with up to 95 % yield in mild conditions
Solid-Supported Microwave-Accelerated Intramolecular Knoevenagel Hetero-Diels-Alder Reactions: A Protocol for the Synthesis of Indolo[2,1-<i>a</i>]pyrrolo[4′,3′:4,5]pyran Ring Systems
A novel and mild method was established to synthesize pyrroloindole derivatives. This method entails an ethylenediammonium diacetate (EDDA)-promoted Knoevenagel condensation of various diones with appropriately substituted aldehydes to yield the arylidene intermediate, which was smoothly converted to the final products by intramolecular Diels-Alder reaction in a tandem manner. This process describes