Dehydrative fragmentation of 5-hydroxyalkyl-1H-tetrazoles: a mild route to alkylidenecarbenes.

Dehydrative fragmentation of 5-hydroxyalkyl-1H-tetrazoles: a mild route to alkylidenecarbenes.
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DOI:
10.1021/ol300276p
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发表时间:
2012-03-16
期刊:
影响因子:
5.2
通讯作者:
Komenda, John P.
Komenda, John P.
中科院分区:
化学1区
文献类型:
--
作者:
Wardrop, Duncan J.;Komenda, John P.

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报道了一种温和的、无碱的亚烷基卡宾的生成方法。用碳化二亚胺处理5-羟基烷基-1H-四氮唑,生成的产物是亚烷基卡宾的1,2-重排或[1,5]-C-H键插入。这种二价中间体的形成被认为是通过四氮富烯的方式发生的,该四氮富烯经历了两个摩尔氮素的挤压。详细介绍了这一方法及其applicationtothesynthesisofcombretastatinA-4andanimprovedrouteto5-hydroxyalkyl-1 H-四氮唑。
The development of a mild, base-free method for the generation of alkylidenecarbenes is reported. Treatment of 5-hydroxyalkyl-1 H-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 two moles of dinitrogen. Details of this methodology, its applicationtothesynthesisofcombretastatinA-4andanimprovedrouteto5-hydroxyalkyl-1 H-tetrazolesare described.
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