Cer(IV)oxidationen von β-Aminoketonen, 8. Mitt.: Synthese von im Piperidinteil verschieden substituierten 1,2,3,4-Tetrahydroisochinolinen
作者:Ulrike Holzgrabe、Elisabeth Inkmann
DOI:10.1002/ardp.19933260406
日期:——
sind durch oxidative Cyclisierung von N‐Benzyl‐β‐aminoketonen mit Cer(IV)sulfat zugänglich. In nahezu allen Fällen werden Diastereomerengemische erhalten. Nach Austausch der Ketofunktion des Aminoketones gegen COOR‐, CN‐, CHO‐ oder NO2‐Gruppen gelingt unter den Standardreaktionsbedingungen keine Cyclisierung, da die Hydrolyse zu N‐Benzyl‐N‐methylaminopropionsäure und die Oxidation in benzylischer Stellung
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.
Synthesis of 3-Substituted 4-Aroylisoquinolines via Pd-Catalyzed Carbonylative Cyclization of <i>o</i>-(1-Alkynyl)benzaldimines
作者:Guangxiu Dai、Richard C. Larock
DOI:10.1021/ol010230y
日期:2002.1.1
[GRAPHICS]o-(1-Alkynyl)benzaldimines react with aryl iodides and 1 atm of CO in the presence of tri-n-butylamine and a Pd(PPh3)(4) catalyst to afford good yields of 3-substituted 4-aroylisoquinolines by acylpalladation of the carbon-carbon triple bond and cyclization.