One‐Pot Synthesis of Diazirines and
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N
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‐Diazirines from Ketones, Aldehydes and Derivatives: Development and Mechanistic Insight
Broad scope one-pot diazirine synthesis strategies have been developed using two different oxidants depending on the nature of the starting material. In all cases, an inexpensive commercial solution of ammonia (NH3) in methanol (MeOH) was employed, avoiding the difficult use of liquid ammonia. With aliphatic ketones, t-butyl hypochlorite (t-BuOCl) was found to be the best oxidant whereas it is preferable
Structure–Reactivity Relationship in the Frustrated Lewis Pair (FLP)‐Catalyzed Hydrogenation of Imines
作者:Sebastian Tussing、Karl Kaupmees、Jan Paradies
DOI:10.1002/chem.201600716
日期:2016.5.23
The autoinduced, frustratedLewispair (FLP)‐catalyzed hydrogenation of 16‐benzene‐ring substituted N‐benzylidene‐tert‐butylamines with B(2,6‐F2C6H3)3 and molecular hydrogen was investigated by kinetic analysis. The pKa values for imines and for the corresponding amines were determined by quantum‐mechanical methods and provided a direct proportional relationship. The correlation of the two rate constants
的autoinduced,沮丧路易斯对(FLP)16 -苯环的催化的加氢取代Ñ -benzylidene-叔-butylamines与B(2,6-F 2 C ^ 6 ħ 3)3和分子氢是由动力学分析调查。亚胺和相应胺的p K a值是通过量子力学方法确定的,并提供了直接的比例关系。两个速率常数k 1(简单的催化循环)和k 2(自动诱导的催化循环)与p K的相关性亚胺和胺对之间的差异(ΔpK a)或Hammett的σ参数用作建立FLP催化的亚胺加氢反应的结构反应性关系的有用参数。
A Metal-Free Approach to 1,2-Diamines via Visible Light-Driven Reductive Coupling of Imines with Perylene as a Photoredox Catalyst
and versatile approach to 1,2-diamines has been developed based on reductivecoupling reactions of various imines, where perylene, an aromatic hydrocarbon, was used as a photoredox catalyst under visiblelight irradiation using a white light-emitting diode. The use of 1 mol % perylene enabled almost complete conversion of the imines, leading to the formation of their corresponding 1,2-diamines, which
Isoquinoline Synthesis via Rhodium-Catalyzed Oxidative Cross-Coupling/Cyclization of Aryl Aldimines and Alkynes
作者:Nicolas Guimond、Keith Fagnou
DOI:10.1021/ja904380q
日期:2009.9.2
A general rhodium-catalyzed oxidative coupling reaction between internal alkynes and aryl aldimines is described. This process affords 3,4-disubstituted isoquinolines in good yield and high regioselectivity. Preliminary mechanistic studies suggest that the C-N bond formation arises from the reductive elimination of a rhodium(III) species.
develop an efficient and workable method for the reduction of imines via hydroboration with HBpin. The low cost and non-toxic Fe exhibits high catalytic activity to this hydroboration. A large range of aldimines comprising diverse aryl groups, alkyl groups and heterocycles proceed the hydroboration well to yield secondary amines in good to excellent yields. Kinetic mechanistic studies indicate the importance
我们开发了一种有效且可行的方法,用于通过 HBpin 硼氢化还原亚胺。低成本且无毒的Fe对这种硼氢化反应具有高催化活性。包含不同芳基、烷基和杂环的大范围醛亚胺可以很好地进行硼氢化,以良好至极好的产率产生仲胺。动力学机制研究表明 Fe 在 HBpin 转化为活性物质中的重要性。通过该策略制备几种市售药物突出了其在药物化学中的潜在应用。