method affords a two-step bond reorganization event (“sew-and-cut”) to access functionalized isoquinoline ring systems directly with high atom economy. C–H bond functionalizations directed by a weakly coordinating bridged amide bond increase scaffold diversity. Preliminary mechanistic studies on the effect of amide distortion and the role of electrophile in this unusual σ N–C amide difunctionalization
Structural Characterization of N-Alkylated Twisted Amides: Consequences for Amide Bond Resonance and N−C Cleavage
作者:Feng Hu、Roger Lalancette、Michal Szostak
DOI:10.1002/anie.201600919
日期:2016.4.11
Herein, we describe the first structuralcharacterization of N‐alkylated twisted amides prepared directly by N‐alkylation of the corresponding non‐planar lactams. This study provides the first experimental evidence that N‐alkylation results in a dramatic increase of non‐planarity around the amide N−C(O) bond. Moreover, we report a rare example of a molecular wire supported by the same amide C=O‐Ag
本文中,我们描述了通过相应的非平面内酰胺的N-烷基化直接制备的N-烷基化的扭曲酰胺的第一个结构表征。这项研究提供了第一个实验证据,表明N-烷基化导致酰胺NC-(O)键周围的非平面性急剧增加。此外,我们报告了由相同的酰胺C = O-Ag键支撑的分子丝的罕见例子。反应性研究表明迅速亲核加成到N-C(O)N-烷基化酰胺的部分,表明缺乏的n个Ñ至π * C = O结合。最关键的是,我们证明了N-烷基化通过可切换的配位激活了原本未反应的酰胺键向σN-C裂解。
Palladium(II) catalysed construction of tetrasubstituted carbon centres, and spiro and bridged-ring compounds from enamides of 2-lodobenzoic acids
Various N-vinyl- and N-allyl-amides of 2-iodobenzoic acid undergo catalytic cyclisation in the presence of tetraethylammonium chloride and a palladium acetate-based catalyst system to generate a range of synthetically useful structural features including tetrasubstitutedcarboncentres, and spiro- and bridged-ringcompounds, and in which 5-exo-trig cyclisations are kinetically favoured.