PhI(OCOCF3)2-Mediated Cyclization of o-(1-Alkynyl)benzamides: Metal-Free Synthesis of 3-Hydroxy-2,3-dihydroisoquinoline-1,4-dione
摘要:
The synthesis of an undocumented skeleton of 3-hydroxy-2,3-dihydroisoquinoline-1,4-diones has been discovered and reported. The reaction consists of an intramolecular cyclization of o-(1-alkynyl)benzamides in MeCN/H2O, mediated by metal-free, hypervalent reagent of PhI(OCOCF3)(2), followed by an oxidative hydroxylation reaction: The mechanism consisting of two pathways has been proposed and discussed:
Reaction of 2-Alkynylbenzoyl
Cyanides with Carboxylic Acids Producing Functionalized Indenones
作者:Masahiro Murakami、Hiroshi Shimizu
DOI:10.1055/s-2008-1078501
日期:——
2-Alkynylbenzoyl cyanides react with carboxylic acidsvia a cyclicallene intermediate to produce 2-acylamino-3-acylindenones in good yield. The high reactivity of the 2-acylamino moiety of the product for a substitution reaction can be utilized for the synthesis of fused heterocycles.
Described herein is the application of a strategy of ligand participation for the Ir-catalyzed imidotransfer into alkynes. On the basis of a stoichiometric [3 + 2] cycloaddition of Cp*Ir(III)(κ2- N, O-chelate) with alkynyl dioxazolone, a catalytic haloamidation was developed for the first time by employing [Cp*IrCl2]2 precatalyst and NaX salts (X = Cl or Br) as practical halide sources to furnish
Copper(II)/DBU Relay Catalyzed Annulation of α-Carbonyl-γ-alkynyl Sulfoxonium Ylides for Accessing <i>N</i>-Sulfonamido 2<i>H</i>-Isoindoles
作者:Peng Zhou、Wei-Tao Yang、Wen-Juan Hao、Bo Jiang
DOI:10.1021/acs.orglett.3c03479
日期:2023.12.1
A copper(II)/DBU relay catalyzed annulation of α-carbonyl-γ-alkynyl sulfoxonium ylides as a new class of sulfoxonium ylide reagents with sulfonyl hydrazides is reported, enabling intramolecular oxygen migration to produce a series of N-sulfonamido 2H-isoindoles with good yields. The present annulation proceeded readily by combining the Cu(II)-catalyzed 6-endo-dig oxo-cyclization with the DBU-catalyzed
PhI(OCOCF<sub>3</sub>)<sub>2</sub>-Mediated Cyclization of <i>o</i>-(1-Alkynyl)benzamides: Metal-Free Synthesis of 3-Hydroxy-2,3-dihydroisoquinoline-1,4-dione
The synthesis of an undocumented skeleton of 3-hydroxy-2,3-dihydroisoquinoline-1,4-diones has been discovered and reported. The reaction consists of an intramolecular cyclization of o-(1-alkynyl)benzamides in MeCN/H2O, mediated by metal-free, hypervalent reagent of PhI(OCOCF3)(2), followed by an oxidative hydroxylation reaction: The mechanism consisting of two pathways has been proposed and discussed:
An efficient stereospecific preparation of (Z)-3-methylidene-selenophthalides and (z)-3-methylidenetellurophthalides
作者:Haruki Sashida、Atsusbi Kawamukai
DOI:10.1002/jhet.5570350131
日期:1998.1
(Z)-3-Methylideneselenophthalides 5A and (Z)-3-methylidenetellurophthalides 5B were easily prepared by the regioselective and stereoselective reaction of 2-ethynylbenzoyl chlorides 3 with sodium hydroselenide and sodium hydrotelluride in good yields, respectively.