[EN] ETHERS AND ESTERS OF 1-SUBSTITUTED CYCLOALKANOLS FOR USE AS AROMA CHEMICALS [FR] ÉTHERS ET ESTERS DE CYCLOALCANOLS SUBSTITUÉS EN POSITION 1 DESTINÉS À ÊTRE UTILISÉS EN TANT QUE PRODUITS CHIMIQUES AROMATIQUES
Efficientborylation of sp3 C–O bonds by supported Au catalysts is described. Au nanoparticles supported on TiO2 showed high activity under mild conditions employing low catalyst loading conditions without the aid of any additives, such as phosphine and bases. A variety of allyl, propargyl, and benzyl substrates participated in the heterogeneously catalyzed reactions to furnish the corresponding allyl
描述了负载型Au催化剂对sp 3 C–O键的有效硼化作用。负载在TiO 2上的Au纳米颗粒在温和条件下采用低催化剂负载条件显示出高活性,而无需任何添加剂,例如膦和碱。各种烯丙基,炔丙基和苄基底物参与了非均相催化反应,以高产率提供了相应的烯丙基,烯丙基和苄基硼酸酯。此外,Au / TiO 2对烯丙基和苄基醇的直接硼化也有效。基于Hammett研究和控制实验的机理研究表明,负载型Au催化剂上的sp 3 C–O键硼化通过S N进行1'型机制涉及碳阳离子中间体的形成。负载的金催化剂的高活性,可重复使用性和环境相容性以及反应体系的可扩展性使有价值的有机硼化合物的实际合成成为可能。
[(NHC)Au<sup>I</sup>]-Catalyzed Rearrangement of Allylic Acetates
作者:Nicolas Marion、Ronan Gealageas、Steven P. Nolan
DOI:10.1021/ol070843w
日期:2007.7.1
[(NHC)AuCl] complexes (NHC = N-heterocycliccarbene), in conjunction with a silver salt, were found to efficiently catalyze the rearrangement of allylic acetates under both conventional and microwave-assisted heating. The optimization of several reaction parameters (solvent, silver salt, and ligand) as well as a study of the reaction scope are reported. The steric hindrance of the ligand bound to gold was
Practical Synthesis of Allylic Silanes from Allylic Esters and Carbamates by Stereoselective Copper-Catalyzed Allylic Substitution Reactions
作者:Martin Oestreich、Gertrud Auer
DOI:10.1002/adsc.200404381
日期:2005.4
The first copper-catalyzedallylic substitution reactions of allylic acetates and carbamates employing a bis(triorganosilyl)zinc reagent are reported. This novel procedure avoids the use of stoichiometric amounts of copper salts which are usually mandatory with this chemistry. Application of this methodology to standard model substrates substantiates a high diastereoselectivity for the double bond
Palladium catalyzed carbonylations of allyl phosphates and allyl acetates give β,γ-unsaturated esters efficiently. The latter reaction requires bromide ion as a co-catalyst.
Palladium catalyzed reaction of allyl acetates with azide ion gives allylazides, which are readily converted into the corresponding primaryallylamines upon treatment with PPh3/NaOH.