Photoredox Radical/Polar Crossover Enables Construction of Saturated Nitrogen Heterocycles
作者:Loïc R. E. Pantaine、John A. Milligan、Jennifer K. Matsui、Christopher B. Kelly、Gary A. Molander
DOI:10.1021/acs.orglett.9b00602
日期:2019.4.5
Photoredox-mediated radical/polar crossover (RPC) processes offer new avenues for the synthesis of cyclic molecules. This process has been realized for the construction of medium-sized saturated nitrogen heterocycles. Photocatalytically generated alkylradicals possessing pendant leaving groups engage imines in C–C bond formation, and subsequent reduction of the intermediate nitrogen-centered radical triggers
Exploration of Forbidden Povarov Processes as a Source of Unexpected Reactivity: A Multicomponent Mannich-Ritter Transformation
作者:Sara Preciado、Esther Vicente-García、Salomé Llabrés、F. Javier Luque、Rodolfo Lavilla
DOI:10.1002/anie.201202927
日期:2012.7.9
geometrically or electronically restricted imines for Povarov‐type processes does not afford the anti‐Bredt tetrahydroquinolines, but leads instead to highly functionalized structures through novel reaction pathways (see picture; LA=Lewis acid). The exploration of “forbidden” routes constitutes a valuable approach in the search for new multicomponent reactions.
当一扇门关闭时,一个窗户就会打开!在Povarov型工艺中使用受几何或电子限制的亚胺并不能提供抗Bredt四氢喹啉,而是通过新颖的反应途径获得高度官能化的结构(参见图片; LA =路易斯酸)。探索“禁止”路线是寻找新的多组分反应的一种有价值的方法。
An Efficient Difluorohydroxylation of Indoles Using Selectfluor as a Fluorinating Reagent
good yields by usingSelectfluor as the electrophilic fluorinating reagent has been developed. In this methodology, the indole rings were difluorinated highly regioselectively at the C3 carbon site. This protocol is practically convenient, easily handled under mild conditions, and provides an efficient way to produce the unique difluorinated indolin-2-ol structure. When alcohols were used as the nucleophiles
Electrochemical Direct C−H Halogenation of N‐Heteroarenes and Naphthols
作者:Pan Tao、Yujun Li、Ke Zheng
DOI:10.1002/ejoc.202300622
日期:2023.9.14
In this study, we introduce an environmentally friendly and highly efficient electrochemical method for regioselective C−H halogenation of (hetero)arenes, achieving moderate to excellent yields in an undivided cell. This approach demonstrates remarkable performance across a wide range of substrates.