Tuning the reactivity of Au-complexes in an Au(i)/chiral Brønsted acid cooperative catalytic system: an approach to optically active fused 1,2-dihydroisoquinolines
Metal-Free Decarboxylative Cyclization/Ring Expansion: Construction of Five-, Six-, and Seven-Membered Heterocycles from 2-Alkynyl Benzaldehydes and Cyclic Amino Acids
A one pot synthesis of 1H‐benzo[g]indoles, tetrahydrobenzo[h]quinolines, and naphtho[1,2‐b]azepines from 2‐alkynyl benzaldehydes and cyclic amino acids is reported. The salient feature of the strategy involves formation of three new bonds (one CN and two CC bonds) by a metal‐free decarboxylation/cyclization/one‐carbon ring expansion sequence in one pot.
carbonyl-tethered 1,7-enynes with sulfinic acids and N-fluorobenzenesulfonimide (NFSI) under mild and redox neutral conditions to access densely functionalized (E)-3,4-dihydronaphthalen-1(2H)-ones with generally good yields and high stereoselectivity. The selectivity of these bifunctionalizations relies on the electronic nature of substituents on both aryl rings of 1,7-enynes.
Regioselective synthesis of functionalized dihydroisoquinolines from o-alkynylarylaldimines via the Reformatsky reaction
作者:Tohasib Yusub Chaudhari、Urvashi Urvashi、Sandeep K. Ginotra、Pooja Yadav、Gulshan Kumar、Vibha Tandon
DOI:10.1039/c6ob01790h
日期:——
of functionalized 1,2-dihydroisoquinolines from o-alkynylarylaldimines via the Reformatskyreaction without the aid of an external Lewis acid has been described. The chemistry involves the dual role of the Reformatsky reagent which has been generated in situ in the reaction. We propose that one molecule of the Reformatsky reagent is being utilised for the activation of alkynes, whereas the second molecule
Iodine-mediated electrophilic tandem cyclization of 2-alkynylbenzaldehydes with anthranilic acid leading to 1,2-dihydroisoquinoline-fused benzoxazinones
作者:Shashikant U. Dighe、Sanjay Batra
DOI:10.1016/j.tet.2013.08.086
日期:2013.11
An efficient iodine-mediated electrophilic tandem cyclization of substituted 2-alkynylbenzaldehydes with anthranilic acids under basic medium leading to iodo-1,2-dihydroisoquinoline-fused benzoxazinones is presented. Success of the protocol for the reaction of substituted 2-alkynylbenzaldehydes with 2-aminobenzamides to furnish isoquinoline-fused quinazolinones is also described.
One-pot synthesis of triazole-fused isoindoles from o-alkynylbenzaldehydes and trimethylsilyl azide
作者:Noriko Okamoto、Takuya Sueda、Hideki Minami、Reiko Yanada
DOI:10.1016/j.tetlet.2018.03.002
日期:2018.4
An efficient one-pot synthesis of 1,2,3-triazole-fused isoindoles from o-alkynylbenzaldehydes and trimethylsilyl azide (TMSN3) is reported. The reaction proceeds through the formation of a diazide intermediate and a subsequent intramolecular azide-alkyne cycloaddition, providing a novel access to a variety of 8-azido-8H-[1,2,3]triazolo[5,1-a]isoindoles in high yields.
据报道,由邻炔基苯甲醛和三甲基硅烷基叠氮化物(TMSN 3)有效地一锅法合成1,2,3-三唑稠合的异吲哚。该反应通过形成二叠氮化物中间体和随后的分子内叠氮化物-炔烃环加成反应而进行,从而提供了一种新颖的途径来获得各种8-azido-8 H- [1,2,3] triazolo [5,1- a ] isoindoles高产。