2-Substituted 5-Acetyl-4-Thiazolyl Triflates as Useful Building Blocks for the Preparation of Functionalized Thiazoles
作者:Antonio Arcadi、Orazio A. Attanasi、Barbara Guidi、Elisabetta Rossi、Stefania Santeusanio
DOI:10.1002/(sici)1099-0690(199911)1999:11<3117::aid-ejoc3117>3.0.co;2-o
日期:1999.11
The readily available 2-substituted 5-acetyl-4-thiazolyl triflates 2are useful building blocks 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
容易获得的 2-取代的 5-乙酰基-4-噻唑基三氟甲磺酸酯 2 是通过钯催化的与有机金属试剂的交叉偶联反应以及烷氧基羰基化和脱氧反应制备官能化噻唑的有用结构单元。钯催化的 2 偶联与 1-炔烃/6-endo-dig 环化反应在氨存在下以令人满意的产率得到官能化的吡啶并 [3,4-c] 噻唑。利用三氟甲磺酸酯基团的未催化置换反应是一种非常简单的合成 4-N-、4-O- 和 4-S- 取代的噻唑的方法。