本文描述了铁/光氧化还原双催化酰基氮烯的形成以及酰基氮烯在构建各种 C-O 键中对苯酞的应用。开发的反应从N -methoxyl-2-alkylbenzamides 开始。机理调查表明,该反应涉及基于铁氮烯的氢原子提取 (HAA)、自由基-极性交叉和O-亲核 S N 1。值得注意的是,未观察到以前出版物中经常报道的自由基反弹。该反应代表了基于酰基氮烯的苯酞合成的第一个例子。此外,它还作为合成3-丁基苯酞(NBP)、沙利度胺、Pomalyst和Otezia等市售药物的补充剂。
Iodoarene-Catalyzed Stereospecific Intramolecular sp3 C–H Amination: Reaction Development and Mechanistic Insights
摘要:
A new strategy is reported for intramolecular Sp(3) C-H amination :under mild reaction conditions using iodoarene as catalyst and m-CPBA as oxidant. This C-H functionalization involving iodine(III) reagents generated in situ occurs readily at sterically hindered tertiary C-H bonds. DFT (M06-2X) calculations show that the preferred pathway involves an iodonium cation intermediate and proceeds via an energetically concerted transition state, through hydride transfer followed by the spontaneous C-N bond formation. ThiS leads to the experimentally observed amination at a chiral center without loss of stereo chemical information.
In this work, by using N-methoxybenzamides as efficient acyl nitrene precursors, an iron-catalyzed formal cis-haloamidation of alkyne is reported. Without assistance of additives, the reaction worked well in the presence of 50 mol% FeCl3 or FeBr3, leading to a series of chloro/bromo-containing isoindolin-5-ones with high efficiency and wide reaction scope. In the reaction, the iron-facilitated haloamidation
Metal-Free Selective <i>Ortho</i>-C–H Amidation of Hypervalent(III) Iodobezenes with <i>N</i>-Methoxy Amides under Mild Conditions
作者:Wei-Hao Rao、Ying-Ge Li、Li-Li Jiang、Qi Li、Guo-Dong Zou、Xinhua Cao
DOI:10.1021/acs.joc.3c01472
日期:2023.10.6
A metal-free selective ortho-C–H amidation of aryl iodines(III) with the use of N-methoxy amides as aminating reagentsundermildconditions is described here. In the protocol, excellent chemoselectivity and high regioselectivity were obtained. Notably, the iodine substituent rendered the amidation product suitable to be used for further elaboration.
A Rh(III)-catalyzed C–H bond activation and subsequent [4+1] annulation of benzamides with vinyl cyclic carbonates have been developed for the synthesis of isoindolinones, in which the electron-rich alkenes could serve as one-carbon units. This reaction proceeds smoothly with high regioselectivity under oxidant- and silver-free conditions and exhibits broad substrate scope and functional group tolerance
Iodoarene-Catalyzed Stereospecific Intramolecular sp<sup>3</sup> C–H Amination: Reaction Development and Mechanistic Insights
作者:Chendan Zhu、Yong Liang、Xin Hong、Heqing Sun、Wei-Yin Sun、K. N. Houk、Zhuangzhi Shi
DOI:10.1021/jacs.5b03488
日期:2015.6.24
A new strategy is reported for intramolecular Sp(3) C-H amination :under mild reaction conditions using iodoarene as catalyst and m-CPBA as oxidant. This C-H functionalization involving iodine(III) reagents generated in situ occurs readily at sterically hindered tertiary C-H bonds. DFT (M06-2X) calculations show that the preferred pathway involves an iodonium cation intermediate and proceeds via an energetically concerted transition state, through hydride transfer followed by the spontaneous C-N bond formation. ThiS leads to the experimentally observed amination at a chiral center without loss of stereo chemical information.