Ti/Pd Bimetallic Systems for the Efficient Allylation of Carbonyl Compounds and Homocoupling Reactions
作者:Alba Millán、Araceli G. Campaña、Btissam Bazdi、Delia Miguel、Luis Álvarez de Cienfuegos、Antonio M. Echavarren、Juan M. Cuerva
DOI:10.1002/chem.201003315
日期:2011.3.28
The allylation, crotylation and prenylation of aldehydes and ketones with stable and easily handled allylic carbonates is promoted by a Ti/Pd catalytic system. This Ti/Pd bimetallic system is especially convenient for the allylation of ketones, which are infrequent substrates in other related protocols, and can be carried out intramolecularly to yield five‐ and six‐membered cyclic products with good
Ti / Pd催化体系可促进醛和酮与稳定且易于处理的烯丙基碳酸酯的烯丙基化,丁酰化和烯丙基化。这种Ti / Pd双金属体系特别适合于酮的烯丙基化,酮是其他相关规程中不常见的底物,并且可以在分子内进行生产,从而产生具有良好立体选择性的五元和六元环状产物。此外,Ti / Pd介导的还原反应和Würtz型二聚反应可以很容易地从碳酸烯丙酯和羧酸酯中进行。
Regioselective palladium-catalyzed allylation of fulvenes
作者:Björn C. Söderberg、Lucinda R. Austin、Carol A. Davis、Jan-Erik Nyström、Jan O. V»gberg
DOI:10.1016/s0040-4020(01)80737-7
日期:1994.4
allylic acetates, and allylic carbonates in the presence of catalytic amounts of bis(dibenzylideneacetone)palladium(O) and triphenyl phosphine in good to excellent yield. A high degree of regioselectivity is observed with regard to the allylic substrate, and the most hindered position was predominately substituted. Inversion of stereochemistry of the allylic carbon by migration of the anion from the metal
Stereoselective palladium-catalyzed allylic alkylations of peptideamide enolates
作者:Swarup Datta、Uli Kazmaier
DOI:10.1039/c0ob00628a
日期:——
Pd-catalyzed allylations are an excellent tool for stereoselectivepeptide modifications, being clearly superior to normal alkylations. The reactions proceed not only in high yield, but also high regio- and diastereoselectivities, and trans-products are formed exclusively. Therefore, this is a powerful synthetic tool for natural product and drug synthesis.
Copper protection in the palladium catalyzed regioselective allylation of a model polyketide: Methyl 3,5-dioxohexanoate
作者:Jorge Marquet、Marcial Moreno-Mañas、María Prat
DOI:10.1016/s0040-4039(00)99414-0
日期:——
allylation of the model polyketide system methyl 3,5-dioxohexanoate at the C-2 position can be accomplished even with secondary and tertiary radicals by palladium catalyzed allylation of its copper(II) complex, 1a. Initial results indicate that the cobalt(II) complex, 1b, can be also useful. Cyclizations of the resulting diketoesters, 3, afford triaceticacidlactone derivatives, 5, regioselectively allylated
The cross-couplingreaction of allylic carbonates with organosilanes was found to proceed without fluoride ion activation under mild conditions by using a coordinatively unsaturated palladium complex as a catalyst. The reaction was assumed to proceed through an allylpalladium alkoxide derived from the allylic carbonate substrate and a palladium(0) species, the alkoxo ligand activating the organosilicon