据报道,氧-炔烃-腈官能团的两个新的水合碳环化反应产生了独特的含氮杂环。在热的1,4-二恶烷中用PtCl 2 / CO / H 2 O长时间加热氧代炔基腈底物,得到2,3-二氢-1 H-吡啶基[1.2 - b ]-异喹啉-4(6 H)-。在该水合反应中,短暂地有效分离出二羰基腈中间体,然后将其进行基于NHC的交叉安息香偶合,得到螺环醇,并进一步与TfOH反应生成螺环[indene-2,2'-哌啶]。-1,6 ′(3 H)-二酮。
Halocyclization of o-(alkynyl)styrenes. Synthesis of 3-halo-1H-indenes
作者:Roberto Sanz、Alberto Martínez、Patricia García-García、Manuel A. Fernández-Rodríguez、Muhammad A. Rashid、Félix Rodríguez
DOI:10.1039/c0cc02590a
日期:——
o-(Alkynyl)styrenes undergo halocarbocyclization processes via a 5-endo-dig ring closure. By this strategy an efficient synthesis of 3-halo-1H-indene derivatives has been developed.
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
Synthesis of 1H-Isochromenes and 1,2-Dihydroisoquinolines by Indium(III)-Catalyzed Cycloisomerization of ortho-(Alkynyl)benzyl Derivatives
作者:Luis A. Sarandeses、José Pérez Sestelo、Fabio Seoane-Carabel、Lorena Alonso-Marañón
DOI:10.1055/s-0042-1751383
日期:——
1H-Isochromenes and 1,2-dihydroisoquinolines are synthesized by regioselective indium(III)-catalyzed intramolecular hydrofunctionalization of o-(alkynyl)benzyl derivatives. The reaction with o-(alkynyl)benzyl alcohols and amines proceeds using indium triiodide (5–10 mol%) in toluene at 80–100 °C via regioselective 6-endo-dig intramolecular alkyne hydroalkoxylation or hydroamination in good yields.
Synthesis of 3-Substituted 4-Aroylisoquinolines via Pd-Catalyzed Carbonylative Cyclization of 2-(1-Alkynyl)benzaldimines
作者:Guangxiu Dai、Richard C. Larock
DOI:10.1021/jo026016k
日期:2002.10.1
A number of 3-substituted 4-aroylisoquinolines have been prepared in good yields by treating N-tert-butyl-2-(1-alkynyl)benzaldimines with aryl halides in the presence of CO and a palladium catalyst. Synthetically the methodology provides a simple and convenient route to isoquinolines containing an aryl, alkyl, or vinylic group at C-3 and an aroyl group at C-4 of the isoquinoline ring. The reaction is believed to proceed via cyclization of the alkyne containing a proximate nucleophilic center promoted by an acylpalladium complex.
Chemoselectivities in the Platinum-Catalyzed Hydrative Carbocyclizations of Oxo-Alkyne-Nitrile Functionalities
作者:Anupam Mukherjee、Rai-Shung Liu
DOI:10.1021/ol1029047
日期:2011.2.18
Two new hydrativecarbocyclizations of oxa-alkyne-nitrile functionalities are reported to produce distinct nitrogen-containing heterocycles. Protracted heating of oxoalkynyl nitrile substrates with PtCl2/CO/H2O in hot 1,4-dioxane gave 2,3-dihydro-1H-pyrido[1.2-b]-isoquinolin-4(6H)-ones. In this hydration reaction, dicarbonyl nitrile intermediates were isolated efficiently after a brief period, and
据报道,氧-炔烃-腈官能团的两个新的水合碳环化反应产生了独特的含氮杂环。在热的1,4-二恶烷中用PtCl 2 / CO / H 2 O长时间加热氧代炔基腈底物,得到2,3-二氢-1 H-吡啶基[1.2 - b ]-异喹啉-4(6 H)-。在该水合反应中,短暂地有效分离出二羰基腈中间体,然后将其进行基于NHC的交叉安息香偶合,得到螺环醇,并进一步与TfOH反应生成螺环[indene-2,2'-哌啶]。-1,6 ′(3 H)-二酮。