benzyl bromide 2 and cinnamyl bromide 3 give products which are dependent both upon the nature of the amine component of the enamine and, in the case of the amides, upon the amine from which the amide is derived. The β-enamino esters react with benzyl bromide to yield predominantly dialkylated products in the case of the pyrrolidine ester 1a. Reactions of the same esters with cinnamyl bromide yield
A Pd(OAc)2/P(OPh)3 combination catalyzed Tsuji–Trost-type allylic amination under aerobic conditions. Both aromatic and aliphatic secondary amines were transformed into the corresponding allylic amines with a tiny amount of the catalyst system (typically 0.02 mol % Pd), only when allylic phosphates were employed as electrophiles. Other typical electrophiles, such as allylic acetate and carbonate, were
Herein, we report on a new UFC reaction that involves the palladium-catalyzed elimination of an isocyanate fragment from an amide, with the formation of carbon–carbon and carbon–heteroatom bonds. An organometallic intermediate that is relevant to the catalytic reaction was characterized by X-ray crystallography. This UFC reaction enables the late-stage transformation of an amide functionality, allowing amides
过渡金属催化的单分子片段偶联 (UFC) 定义为通过分子(如 CO 和 CO 2)的挤出以及随后剩余片段的重组形成新化学键的过程。在此,我们报道了一种新的 UFC 反应,该反应涉及钯催化从酰胺中消除异氰酸酯片段,形成碳-碳和碳-杂原子键。通过 X 射线晶体学表征了与催化反应相关的有机金属中间体。这种 UFC 反应能够实现酰胺官能团的后期转化,从而使酰胺能够用作可转换的导向或保护基团。
Ruthenium-catalyzed linear selective allylic aminations of monosubstituted allyl acetates
The ruthenium-catalyzed highly linear selective allylic amination of monosubstituted allylic acetates with secondary amines was developed. The regioselectivity was controlled by the RU3(CO)(12)/2-DPPBA catalyst, and a linear-type aminated product was obtained as a single regioisomer. (C) 2008 Elsevier Ltd. All rights reserved.
KANNER, C. B.;PANDIT, U. K., TETRAHEDRON, 1982, 38, N 24, 3597-3604