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.
光催化C-H键活化是在温和条件下用双氧选择性官能化C(sp 3 )-H键的具有挑战性的方法。在此,通过融合过渡金属催化和光催化,光活性Cu( I )–卤化物(X)(X=Cl、Br、I)簇被用来有效催化C的选择性单氧化和C-C氧化交叉偶联。 (sp 3 )–H 在光照射下与不反应的 O 2形成键。这种现代方案有望在 Cu( I ) 团簇和 O 2之间发生光诱导 SET 过程,并可能形成 Cu( II )–O 2 ˙ -物质,用于从 C(sp 3 )–H 键中提取 H 原子。该过程产生烷基自由基,与-OOH或亲核试剂反应产生氧化或交叉偶联产物,从而将Cu( I )簇介导的光氧化还原催化作用推向具有所追求选择性的功能性精细化学品。
the aerobic CDC reactions. The results indicated that NH3·H2O coprecipitated CuMgAl LDH (N-CuMgAl-LDH) was able to efficiently accelerate the CDC reactions between the α-Csp3–H of N-aryltetrahydroisoquinolines and nucleophiles. A wide scope of N-aryltetrahydroisoquinoline analogues and nucleophiles with different CH bonds (Csp3–H, Csp2–H and Csp–H) could be tolerated by the N-CuMgAl-LDH system. Compared
The direct α-C(sp<sup>3</sup>)–H functionalisation of N-aryl tetrahydroisoquinolines via an iron-catalysed aerobic nitro-Mannich reaction and continuous flow processing
作者:Martin Brzozowski、Jose A. Forni、G. Paul Savage、Anastasios Polyzos
DOI:10.1039/c4cc07913b
日期:——
An efficient nitro-Mannich type direct α-C(sp3)–H functionalisation of N-aryl-1,2,3,4-tetrahydroisoquinolines catalysed by simple iron salts in combination with O2 as the terminal oxidant is described.
N-Aryl Groups Are Ubiquitous in Cross-Dehydrogenative Couplings Because They Stabilize Reactive Intermediates
作者:Althea S.-K. Tsang、A. Stephen K. Hashmi、Peter Comba、Marion Kerscher、Bun Chan、Matthew H. Todd
DOI:10.1002/chem.201700430
日期:2017.7.12
mechanism of cross‐dehydrogenative coupling (CDC) reactions has been examined by experimental and computational methods. We provide a rationale for the ubiquity of the N‐arylgroup in these reactions. The aryl substituent stabilizes two intermediates and the high‐energy transition state that connects them, which together represent the rate‐determining step. This knowledge has enabled us to predict whether
Efficient aerobic cross-dehydrogenative coupling of tertiary amines over NiGa layered double oxide
作者:Zhonghua Sun、Zhenzhen Xia、Anwei Wang、Hui Wang、Zhong Zhang、Weiyou Zhou、Junfeng Qian、Mingyang He
DOI:10.1016/j.tetlet.2020.152254
日期:2020.8
An efficient and convenient heterogeneous catalytic system has been developed for the aerobic cross-dehydrogenative coupling over NiGa layered double oxide (Ni3Ga-LDO) without any additives. The results indicated that the catalytic system could tolerate various tetrahydroquinoline derivatives and nucleophiles using molecular oxygen as a sustainable oxidant. The catalyst could be recycled four times
In this communication we describe the oxidativeCCbondformation of tertiary amines with various nucleophiles under very mild and environmental friendly conditions by using mesoporous graphitic carbon nitride (mpg‐C3N4) semiconductor as a heterogeneous, metal‐free photosensitizer in combination with visiblelight and oxygen as the terminal oxidation agent. This system can be further combined with
在本通讯中,我们通过使用介孔石墨碳氮化碳(mpg-C 3 N 4)半导体作为非均相,无金属的光敏剂组合,描述了在非常温和且环境友好的条件下叔胺与各种亲核试剂的氧化CC键形成用可见光和氧气作为终端氧化剂。该系统可以进一步与脯氨酸-有机催化结合使用,以实现氧化串联光催化,这证明了当前光合作用系统的丰富化学可能性。