最近,四氢异喹啉与硝基烷烃的交叉脱氢反应已成为有机化学中广泛研究的反应。无论使用何种催化和活化方式,通常都会形成相应的β-硝基胺。当负载在二氧化钛上的铜纳米颗粒催化反应时,观察到非常不同的行为,导致形成具有高选择性和高收率的5,6-二氢吲哚并[2,1- a ]异喹啉。在实验的基础上,提出了一种精细的反应机理,并讨论了这些化合物的关键化学修饰。显然,催化剂的有效性在于其纳米结构的特性,胜过了商用铜催化剂的活性。
Substrate Promiscuity of <i>ortho</i>-Naphthoquinone Catalyst: Catalytic Aerobic Amine Oxidation Protocols to Deaminative Cross-Coupling and <i>N</i>-Nitrosation
作者:Tengda Si、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acscatal.9b03442
日期:2019.10.4
been identified as versatile aerobicoxidationcatalysts. Primary amines were readily cross-coupled with primary nitroalkanes via deaminative pathway to give nitroalkene derivatives in good to excellent yields. Secondary and tertiary amines were inert to ortho-naphthoquinone catalysts; however, secondary nitroalkanes were readily converted by ortho-naphthoquinone catalysts to the corresponding nitrite
A recyclable self-assembled composite catalyst consisting of Fe<sub>3</sub>O<sub>4</sub>-rose bengal-layered double hydroxides for highly efficient visible light photocatalysis in water
The first case of a highlyefficient layered double hydroxide (LDH) supported organic visiblelightphotocatalyst is reported and it can catalyze various organic transformations with high efficiency in water under visiblelight irradiation.
A breath of fresh air: The title reaction has been developed for the coupling of amines with nitroalkanes and different unmodified ketones usingair as the sole oxidant under mild reaction conditions. The safe, convenient, and environmentally benign process, as well as the low catalyst loading, short reaction time, and good yields make this protocol very practical (see scheme).
ruthenium-based magnetically recoverable photoredox nanocatalyst with a large surface area. This visible light harvesting nanocatalyst was effectively used for cross-dehydrogenative coupling via C–H activation between tertiary amines and various carbon nucleophiles with high regioselectivity to afford the C–C coupled products in good to excellent yield using air as an oxidant under ambient conditions. The
A useful method for molecular iodine catalyzedoxidativeC–C bond formation between tertiary amines and a carbon nucleophile using hydrogen peroxide as the terminal oxidant is reported. This is the first report of a molecular iodine catalyzed cross-dehydrogenative coupling (CDC) reaction between two sp3 C–H bonds.