cross-coupling reaction between acylchromate complexes and allylic bromides takes place under CO atmosphere in the presence of a catalytic amount of Pd(PPh3)4 to afford the corresponding allylic ketones in good yield. The same reaction also proceeds by adding RNC under argon atmosphere in place of CO atmosphere. Thus, the acylchromate complex works as a good acyl donor for Pd catalyzed acylation reaction.
在催化量的 Pd(PPh3)4 存在下,在 CO 气氛下,酰基铬酸盐配合物和烯丙基溴之间发生交叉偶联反应,以良好的收率提供相应的烯丙基酮。通过在氩气气氛下添加 RNC 代替 CO 气氛,也可以进行相同的反应。因此,酰基铬酸盐络合物可作为 Pd 催化酰化反应的良好酰基供体。
Carbonylative Cross‐Coupling Reaction of Allylic Alcohols and Organoalanes with 1 atm CO Enabled by Nickel Catalysis
The direct chemoselective carbonylative cross-coupling reaction of allylic alcohols and organoalanes with 1 atm CO via nickel catalysis has been developed to access the β,γ-unsaturated ketones with broad scope. The use of organoalanes as both the coupling components and the activators for the alcohol functionalization was found to be both crucial and advantageous as the method does not require any
已经开发了通过镍催化烯丙醇和有机烷烃与 1 atm CO 的直接化学选择性羰基化交叉偶联反应来获得具有广泛范围的 β,γ-不饱和酮。由于该方法不需要任何外部活化剂,因此发现使用有机丙烷作为偶联组分和醇官能化的活化剂既是关键又是有利的。
Phosphinecarbonylnitrosylacylcobaltate complexes as acyl transfer reagents. Acylation of allylic halides, conjugated enones, and quinones
作者:Louis S. Hegedus、Robert J. Perry
DOI:10.1021/jo00224a061
日期:1985.11
Selective Functionalization of a Variety of Hydrocarbon C(sp<sup>3</sup>)–H Bonds Initiated by Cp*W(NO)(CH<sub>2</sub>CMe<sub>3</sub>)(η<sup>3</sup>-CH<sub>2</sub>CHCHPh)
作者:Russell J. Wakeham、Rhett A. Baillie、Brian O. Patrick、Peter Legzdins、Devon C. Rosenfeld
DOI:10.1021/acs.organomet.6b00739
日期:2017.1.9
Cp*W(NO)(CH2CMe3)(eta(3)-CH2CHCHPh) (1) effects C(sp(3))-H activations of methane, ethane, propane, and n-butane exclusively at their terminal carbons and forms the corresponding Cp*W(NO)(alkyl)(eta(3)-CH2CHCHPh) complexes. It also activates (n-Bu)(2)O, 1-chloropropane, and Me4Si in a similar manner. Exposure of the Cp*W(NO)(alkyl)(eta(3)-CH2CHCHPh) complexes to carbon monoxide results in initial 1,1-CO insertion into the newly formed tungsten alkyl bonds and formation of the corresponding eta(1)-aryl complexes, some of which can be isolated. Additional functionalization of the C -H activation products occurs upon exposure to CO under more forcing conditions. Such treatment produces eta(2)-bound unsaturated-ketone complexes resulting from CO insertion into the W-alkyl sigma bonds followed by cross-coupling of the eta(1)-aryl and the eta(3)-allyl ligands and coordination of CO at the resulting vacant coordination site at tungsten. The unsaturated ketones can be released from the metal's coordination spheres either by photolysis of the complexes in MeCN or by further exposure of them to CO. All new compounds have been characterized by conventional spectroscopic and analytical methods, and. the solid-state molecular structures of six of them have been established by single-crystal X-ray crystallographic analyses.