Dehydrative Fragmentation of 5-Hydroxyalkyl-1<i>H</i>-tetrazoles: A Mild Route to Alkylidenecarbenes
作者:Duncan J. Wardrop、John P. Komenda
DOI:10.1021/ol300276p
日期:2012.3.16
The development of a mild, base-free method for the generation of alkylidenecarbenes is reported. Treatment of 5-hydroxyalkyl-1H-tetrazoles with carbodiimides generates products arising from the 1,2-rearrangement or [1,5]-C–H bond insertion of a putative alkylidenecarbene. Formation of this divalent intermediate is proposed to occur by way of a tetraazafulvene, which undergoes extrusion of 2 mol of
据报道,开发了一种温和、无碱的亚烷基碳烯生成方法。用碳二亚胺处理 5-羟烷基-1 H -四唑会产生由推定的亚烷基碳烯的 1,2-重排或 [1,5]-C-H 键插入产生的产物。这种二价中间体的形成是通过四氮杂富烯的方式发生的,四氮杂富烯经历了 2 摩尔二氮的挤出。描述了该方法的细节、其在考布他汀 A-4 合成中的应用以及 5-羟烷基-1 H-四唑的改进路线。