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N,N'-Diamidocarbenes Facilitate Selective C-H Insertions and Transfer Hydrogenations

机译:N,N'-二酰胺基碳烯有助于选择性C-H插入和转移加氢

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Over the past several decades, C-H activation has emerged as an attractive method for transforming abundant starting materials into valuable products.~([1]) With the potential to streamline synthetic strategies, increase atom economy, and minimize waste, methods for the selective activation of ubiquitous C-H bonds are of intense interest.~([2]) Carbenes are well positioned for such purposes as C-H activation has been a hallmark reaction since an early report by Buchner and Curtius in 1885,~([3]) though most carbenes capable of these transformations are typically generated in situ and utilize directing transition metals.~([4]) Isolable carbenes, in comparison, offer the potential for streamlined syntheses of new classes of highly functionalized substrates without byproduct formation. While stable phosphinosilyl,~([5]) arylamino,~([6]) aminophosphino,~([7]) and diaminocarbenes~([8,9]) (Figure 1) have been shown to undergo intramolecular C-H insertions, the more versatile intermolecular analogues have remained elusive. Indeed, the only examples of intermolecular C-H insertions involving isolable carbenes to date have either been metal catalyzed~([10]) or utilized substrates containing relatively acidic C-H bonds (pK_a<25).~([11])
机译:在过去的几十年中,CH活化已经成为一种吸引人的方法,可以将丰富的起始原料转化为有价值的产品。〜([1])具有简化合成策略,增加原子经济性和减少浪费的潜力,是选择性活化的方法〜[[2])自从1885年Buchner和Curtius的早期报道以来,CH的活化一直是标志性反应,〜([3])尽管大多数卡宾都对碳烯进行了很好的定位,但是碳原子的位置也很受关注。能够进行这些转化的化合物通常是在原位生成的,并利用了过渡金属。[4]相比之下,可分离的羰基苯甲醚可以简化新型的高度官能化底物的合成,而不会形成副产物。稳定的膦基甲硅烷基,〜([5])芳基氨基,〜([6])氨基膦基,〜([7])和二氨基碳烯〜([8,9])(图1)已显示发生分子内CH插入,更通用的分子间类似物仍然难以捉摸。实际上,迄今为止,涉及可分离的卡宾的分子间C-H插入的唯一例子要么是金属催化的[[10]),要么是利用了含有相对酸性C-H键的底物(pK_a <25)。([11])。

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