Palladium-catalyzed carbonylative cyclization via trapping of acylpalladium derivatives with internal enolates. Its scope and factors affecting the C-to-O ratio
摘要:
The Pd-catalyzed carbonylative cyclization reaction involving omega-acyl-substituted acylpalladium derivatives can proceed via intramolecular trapping with either C- or O-enolates; the preferential formation of either 5- or 6-membered rings dictates the C-to-O ratio in the trapping with enolates.
We describe transfer carbonylation reactions of 2‐bromoarenes that contain a carbon‐nucleophile using aldehydes as a substitute for CO, leading to the formation of indanone derivatives. The transformation proceeds efficiently under RhI/Pd0‐hybrid catalytic conditions consisting of two discrete transition metals, rhodium and palladium, which catalyze the decarbonylation of aldehydes and the subsequent
我们描述了使用醛代替CO的含碳亲核试剂的2-溴代芳烃的转移羰基化反应,从而导致茚满酮衍生物的形成。在由两种离散过渡金属铑和钯组成的Rh I / Pd 0混合催化条件下,该转化有效地进行,这两种催化金属分别催化醛的脱羰作用和随后使用所得羰基部分进行的溴代芳烃的羰基化。大部分提取的CO均通过从铑到钯的CO中继过程直接转移到产品中。
Rh(I)-catalyzed CO gas-free carbonylative cyclization of organic halides with tethered nucleophiles using aldehydes as a substitute for carbon monoxide
The CO gas-free carbonylative cyclization of organic halides, with tethered nitrogen, oxygen, and carbon nucleophiles, with aldehydes as a substitute for carbon monoxide can be achieved in the presence of a catalytic amount of a rhodium complex. The reaction involves the decarbonylation of the aldehyde by the rhodium catalyst, and the successive carbonylation of an organic halide utilizing the rhodium carbonyl that is formed in situ. Aldehydes having electron-withdrawing groups showed a higher ability to donate the carbonyl moiety. (c) 2006 Elsevier B.V. All rights reserved.
Carbonylative cyclization via intramolecular trapping of acylmetal derivatives by carbon nucleophiles catalyzed by late transition metals