2<i>H</i>-Azirine-2-carbonyl Azides: Preparation and Use as N-Heterocyclic Building Blocks
作者:Liya D. Funt、Yulia V. Krivolapova、Olesya V. Khoroshilova、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1021/acs.joc.9b03367
日期:2020.3.20
2H-Azirine-2-carbonyl azides, new reactive heterocyclic building blocks, were synthesized in high yield by the reaction of sodium azide with 2H-azirine-2-carbonyl chlorides, generated by Fe(II)-catalyzed isomerization of 5-chloroisoxazoles. 2-(Azidocarbonyl)-1H-pyrroles, prepared by the Ni(II)-catalyzed reaction of 2-(azidocarbonyl)-2H-azirines with 1,3-diketones easily undergo the Curtius rearrangement
2H-Azirine-2-羰基叠氮化物是一种新型的反应性杂环结构单元,通过叠氮化钠与2H-Azirine-2-羰基氯化物的反应高收率合成,Fe(II)催化五氯异恶唑的异构化反应生成2H-Azirine-2-羰基氯化物。2-(叠氮羰基)-1H-吡咯是通过Ni(II)催化2-(叠氮羰基)-2H-叠氮基与1,3-二酮的反应制备的,在沸腾的tBuOH中容易发生库尔修斯重排,从而得到Boc保护的α -氨基吡咯的产率高。在惰性溶剂中短时间加热2-(叠氮羰基)-1H-吡咯会导致高产率地形成苯并-和杂合的1H-吡咯并[2,3-b]吡啶-6(7H)-,它们是通过6π电环化反应形成的,该环化反应涉及邻位芳基或杂芳基取代基以及叠氮羰基的Curtius重排产生的异氰酸酯的N = C键。