Copper‐Catalyzed One‐Pot Cascade Cyclization for the Synthesis of Isoindolo[2,1‐
<i>a</i>
]quinoxalines
作者:Ling Li、Zhen‐Ting Liu、Xiang‐Ping Hu
DOI:10.1002/adsc.202100643
日期:2021.9.7
A copper-catalyzed one-pot cascade cyclization of 2-(1-(acetyloxy)propargyl)benzaldehydes with o-phenylenediamines for an access to substituted isoindolo[2,1-a]quinoxalines has been developed. The reaction features readily available starting materials, simple operational procedure, and broad substrate scopes. Under optimal conditions, various isoindolo[2,1-a]quinoxalines were afforded in 41–88% yields
已开发出铜催化的 2-(1-(乙酰氧基) 炔丙基) 苯甲醛与邻苯二胺的一锅级联环化反应,以获得取代的异吲哚并 [2,1- a ] 喹喔啉。该反应具有原料易得、操作简单、底物范围广等特点。在最佳条件下,各种异吲哚并[ 2,1- a ]喹喔啉的产率为41-88%。
Gold-Catalyzed Stereoselective Synthesis of 9-Oxabicyclo[3.3.1]nona-4,7-dienes from Diverse 1-Oxo-4-oxy-5-ynes: A Viable Formal [4 + 2] Cycloaddition on an <i>s</i>-<i>trans</i>-Heterodiene Framework
作者:Tse-Min Teng、Arindam Das、Deepak B. Huple、Rai-Shung Liu
DOI:10.1021/ja106493h
日期:2010.9.15
We report a highly stereoselective Au-catalyzed synthesis of 9-oxabicyclo[3.3.1]nona-4,7-dienes from diverse 1-oxo-4-oxy-5-ynes. Formation of these highly strained anti-Bredt oxacycles implies the workability of an unprecedented 1,4-dipole of s-trans-methylene(vinyl)oxonium. This work reveals the feasibility of a formal [4 + 2] cycloaddition on an s-trans-heterodiene framework.
Silver-Catalyzed exo-dig-Azacyclization/[3+2] Cycloaddition Cascades on 1-Tosylhydrazon-4-oxy-5-yne Substrates: Applicability to Diverse Alkenes
作者:Deepak B. Huple、Chun-Hao Chen、Arindam Das、Rai-Shung Liu
DOI:10.1002/adsc.201100263
日期:2011.8
We report the silver-catalyzed tandem 6-exo-dig-azacyclization/[3+2] cycloadditioncascade on 1-tosylhydrazon-4-oxy-5-ynes to form complicated azacyclic products regioselectively and efficiently. The new azacyclic syntheses have a wide range of reaction scope, with respect to both substrates and alkenes.
An intramolecular Cu-catalyzed asymmetric propargylic [4 + 2] cycloaddition of bis-N-nucleophile-functionalized propargylic esters has been realized in the support of a chiral tridentate N-ligand, (S,S)-Pybox-diOAc, leading to chiral tetrahydroisoindolo[2,1-a]quinoxalines in high yields and with good to excellent enantioselectivities. The reaction features high efficiency, simplicity, and broad substrate
在手性三齿 N-配体 ( S , S )-Pybox-diOAc 的支持下,实现了双-N-亲核试剂官能化的炔丙基酯的分子内 Cu 催化的不对称炔丙基 [4 + 2] 环加成反应,从而产生手性四氢异吲哚[2,1- a ]喹喔啉的收率高,对映选择性良好。该反应具有高效、简单和广泛的底物范围,从而为立体选择性获得原本难以合成的光学活性多环杂环骨架提供了强大而简洁的策略。