Rapid access to benzo-annelated heterocycles, naphthalenes, and polysubstituted benzenes through a novel benzannulation reaction
作者:Inga Cikotiene、Rita Buksnaitiene、Rokas Sazinas
DOI:10.1016/j.tet.2010.11.073
日期:2011.1
mercaptoacetate triggered benzannulation reaction is described. The precursors are heterocyclic, aromatic or acyclic compounds bearing a carbonyl group at ortho position to an internal alkyne. The methodology does not require transition-metal catalysts and moreover it is general for the preparation of wide range of benzo-annelated heterocycles, naphthalenes and benzenes.
A firstexample of simple and efficient hydrophilic Pd-phosphine complexes catalyzed one-pot three-component reaction of ortho-bromo aldehydes, terminal alkynes and ammonium acetate proceeds through the tandem coupling-imination-annulation path for the synthesis of substituted isoquinolines, furopyridines and thienopyridines in good to excellent yields in green aqueousmedium at mild temperature was
One‐pot Synthesis of Isoquinoline‐Fused Isoquinolines via Intramolecular Hydroamination/Aza‐Claisen Type Rearrangement Cascade
作者:Wei‐Jung Chiu、Jin‐Yu Chen、Shih‐I Liu、Indrajeet J. Barve、Wan‐Wen Huang、Chung‐Ming Sun
DOI:10.1002/adsc.202001576
日期:2021.6.8
Pictet-Spengler reaction between α-amino acid esters and 2-alkynyl benzaldehydes to give isoquinoline intermediates. Subsequent gold-catalyzed intramolecular hydroamination furnishes isoquinoline-fused isoquinolines. The scope of this strategy is further extended to prepare multisubstituted isoquinoline-fused isoquinolines via subjecting the N-allylated isoquinoline intermediates to gold-catalyzed intramolecular
A Facile Route to H-Pyrazolo[5,1-a]isoquinolines through a Multicomponent Reaction of 2-Alkynylbenzaldehyde, Sulfonylhydrazine, and Benzyne
作者:Jie Wu、Jinming Yang、Xingxin Yu
DOI:10.1055/s-0033-1341102
日期:——
Abstract A facile and efficient route for the generation of H-pyrazolo[5,1-a]isoquinolines via a silver triflate catalyzed three-component reaction of 2-alkynylbenzaldehyde, tosylhydrazine, and benzyne is reported. This reaction proceeds smoothly under mild conditions with high efficiency. A facile and efficient route for the generation of H-pyrazolo[5,1-a]isoquinolines via a silver triflate catalyzed
摘要 据报道,通过三氟甲磺酸银催化的2-炔基苯甲醛,甲苯磺酰肼和苯甲醛的三组分反应生成H-吡唑并[5,1- a ]异喹啉的简便有效途径。该反应在温和条件下可以高效地顺利进行。 据报道,通过三氟甲磺酸银催化的2-炔基苯甲醛,甲苯磺酰肼和苯甲醛的三组分反应生成H-吡唑并[5,1- a ]异喹啉的简便有效途径。该反应在温和条件下可以高效地顺利进行。
Synthesis of the dibenzo[<i>b</i>,<i>d</i>]azepine skeleton <i>via</i> a catalyst-free ring expansion domino reaction
In this article, a hitherto unreported catalyst-free ringexpansionreaction of tetrahydroisoquinolines with o-alkynylarylaldehydes for the construction of the dibenzo[b,d]azepine skeleton is described. Using air as a “green” oxidant, some important biologically active dibenzo[b,d]azepines were produced with favorable functional group tolerance and a wide substrate scope. The synthetic potential was
在本文中,描述了迄今为止未报道的四氢异喹啉与邻炔基芳醛的无催化剂扩环反应,用于构建二苯并[ b , d ]氮杂骨架。利用空气作为“绿色”氧化剂,制备了一些具有良好的官能团耐受性和广泛的底物范围的重要生物活性二苯并[ b , d ]氮杂卓类化合物。通过简单的放大反应和异吲哚啉衍生物的合成进一步证实了合成潜力。