An Efficient Approach to Fused Indolines via a Copper(I)-Catalyzed Reaction of Sulfonyl Azide with 2-Ethynylaryl Methylenecyclopropane
作者:Shaoyu Li、Yong Luo、Jie Wu
DOI:10.1021/ol2011067
日期:2011.6.17
A cascade reaction of 2-ethynylaryl methylenecyclopropane with sulfonylazide catalyzed by copper(I) iodide under mild conditions is described, which provides a novel and efficient route for the generation of fused indolines.
Formation of Condensed 1<i>H</i>-Pyrrol-2-ylphosphonates and 1,2-Dihydropyridin-2-ylphosphonates via Kabachnik–Fields Reaction of Acetylenic Aldehydes and Subsequent 5-<i>exo</i>-<i>dig</i> or 6-<i>endo</i>-<i>dig</i> Cyclizations
Kabachnik–Fields reactions of various carbocyclic or heterocyclic acetylenic aldehydes together with subsequent Lewis acid catalyzed cyclizations have been studied. It was found that 5-exo-dig versus 6-endo-dig cyclization mode strongly depends on the structure of starting materials. Thus, nonaromatic acetylenic α-anilinomethylphosphonates underwent gold(III)-catalyzed or iodine-mediated 5-exo-dig
Carbon Tetrachloride-Mediated Cyclization of (2-Alkynyl)arylaldimines for the Synthesis of Polychlorinated Nitrogen Heterocycles
作者:Hai-Yang Wang、Shi-Kai Tian
DOI:10.1021/acs.orglett.9b02010
日期:2019.7.19
mediate the 6-endo-dig cyclization of (2-alkynyl)arylaldimines, generated in situ from (2-alkynyl)arylaldehydes and primary amines, has been developed via formal insertion of C═N and C≡C bonds into a C–Cl bond under catalyst-free conditions, providing convenient access to a range of structurally diverse polychlorinated 1,2-dihydroisoquinolines and heteroarene-fused nitrogenheterocycles.
A silver-catalyzed chemodivergent cyclization of alkyne-tethered aldehydes with aminals to aminomethylated 1H-isochromenes and naphthols is described by tuning the reaction conditions. The reaction exhibits broad substrate generality and functional group compatibility. Mechanistic studies have disclosed that the aminomethylated naphthols are generated from the resulting N,O-aminal containing isochromenes