Pyrido[3,4-<i>c</i>]Thiazoles through Combined Palladium-Catalysed Coupling of 2-Substituted-5-acetyl-4-thiazolyltriflates with Alkynes/Annulation Reactions
作者:Antonio Arcadi、Orazio A. Attanasi、Barbara Guidi、Elisabetta Rossi、Stefania Santeusanio
DOI:10.1246/cl.1999.59
日期:1999.1
2-Substituted-5-acetyl-4-thiazolyltriflates give in good yields functionalised pyrido[3,4-c]thiazoles through combined palladium-catalysed coupling with 1-alkynes/6-endo-dig annulation reactions in the presence of ammonia.
The readily available 2-substituted5-acetyl-4-thiazolyltriflates 2are usefulbuildingblocks for the preparation of functionalised thiazoles by means of palladium-catalysed cross-coupling reactions with organometallic reagents and alkoxycarbonylation and deoxygenation reactions. The combination of palladium-catalysed coupling of 2 together with 1-alkynes/6-endo-dig annulation reactions in the presence