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
An efficient synthesis of tetrahydroquinolines has been achieved by the reaction of aldimines derived from various substituted aromatic amines and indole-2-carbaldehyde containing an internal dienophile using 20 mol % InCl3 in acetonitrile at room temperature. The reactions are very fast and the products are isolated in good yields and in pure form.