Traceless Tosylhydrazone-Based Triazole Formation: A Metal-Free Alternative to Strain-Promoted Azide-Alkyne Cycloaddition
作者:Sander S. van Berkel、Sebastian Brauch、Lars Gabriel、Michael Henze、Sebastian Stark、Dimitar Vasilev、Ludger A. Wessjohann、Muhammad Abbas、Bernhard Westermann
DOI:10.1002/anie.201108850
日期:2012.5.29
Triple‐T trick! Traceless tosylhydrazone‐based triazole formation is readily achieved by reacting primary amines with functional α,α‐dichlorotosylhydrozones under ambient conditions. This fast and efficient alternative affords exclusively 1,4‐substituted triazole “click products” with complete retention of configuration. Primary amines, inherent to many natural products, can be modified in this way
三重T技巧!在环境条件下,通过使伯胺与功能性α,α-二氯甲苯磺酰基氢react反应,可以轻松实现基于甲苯磺酰hydr的无痕三唑的形成。这种快速有效的替代方案可提供完全保留构型的专有1,4-取代的三唑“点击产品”。许多天然产物所固有的伯胺可通过这种方式进行修饰,而无需保护基团。