Tert‐Butyl Nitrite‐initiated C−N Bond Cleavage of 1‐Nitromethyl‐N‐aryltetrahydroisoquinolines: Synthesis of Furoxans with N−NO Skeleton
摘要:
AbstractA series of furoxan derivatives with N‐nitroso groups were synthesized in good yields by TBN initiated radical sp3 C−N bond cleavage of 1‐nitromethyl‐N‐aryltetrahydroisoquinolines. This reaction grafts the biologically important furoxan skeleton and N‐nitroso group into on molecule, greatly improving the molecular complexity in one step transformation. The mechanistic study shows that this reaction is mediated by the in situ generated α‐carbonyl nitrile oxide, which is afforded by TBN promoted C−N bond cleavage.
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 Robust Palladium(II)-Porphyrin Complex as Catalyst for Visible Light Induced Oxidative CH Functionalization
作者:Wai-Pong To、Yungen Liu、Tai-Chu Lau、Chi-Ming Che
DOI:10.1002/chem.201203774
日期:2013.4.26
A series of palladium(II)–porphyrin complexes that display dual emissions with lifetimes up to 437 μs have been synthesized. Among the four complexes, PdF20TPP is an efficient and robust catalyst for photoinduced oxidativeCHfunctionalization by using oxygen as terminal oxidant. α‐Functionalized tertiary amines were obtained in good to excellent yields by light irradiation (λ>400 nm) of a mixture
A Visible Light Photocatalytic Cross-Dehydrogenative Coupling/Dehydrogenation/6π-Cyclization/Oxidation Cascade: Synthesis of 12-Nitroindoloisoquinolines from 2-Aryltetrahydroisoquinolines
A visiblelight‐induced photocatalytic dehydrogenation/6π‐cyclization/oxidation cascade converts 1‐(nitromethyl)‐2‐aryl‐1,2,3,4‐tetrahydroisoquinolines into novel 12‐nitro‐substituted tetracyclic indolo[2,1‐a]isoquinoline derivatives. Various photocatalysts promote the reaction in the presence of air and a base, the most efficient being 1‐aminoanthraquinone in combination with K3PO4. Further, the
可见光诱导的光催化脱氢/6π环化/氧化级联反应将1-(硝基甲基)-2-芳基-1,2,3,4-四氢异喹啉转化为新型的12-硝基取代的四环吲哚[2,1- a ]异喹啉衍生物。各种光催化剂可在空气和碱的存在下促进反应,最有效的是将1-氨基蒽醌与K 3 PO 4结合使用。此外,通过扩展单锅程序与前述的光催化交叉脱氢偶联反应,可直接从C1未官能化的2‐芳基1,2,3,4‐四氢异喹啉中直接获得12‐硝基吲哚异喹啉产物,从而产生四级联反应转型。
A Highly Efficient Gold-Catalyzed Oxidative CC Coupling from CH Bonds Using Air as Oxidant
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