Mild and efficient silylation of alcohols and phenols with HMDS using Bi(OTf)3 under solvent-free condition
作者:Santosh T. Kadam、Sung Soo Kim
DOI:10.1016/j.jorganchem.2009.04.001
日期:2009.7
A very efficient and mildsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) at rt is developed using Bi(OTf)3 as the catalyst. Primary, secondary and tertiary alcohols as well as phenols are excellently converted into corresponding TMS ethers in a very short reaction time. This procedure can also be applied to large scale silylation for industrial application.
at room temperature. While, under the same reaction conditions [Sn IV (TPP)Cl 2 ] is less efficient to catalyze these reactions. One important feature of this catalyst is its ability in the chemoselective silylation of primary alcohols in the presence of secondary and tertiaryalcohols and phenols. The catalyst was reused several times without loss of its catalytic activity.
Asymmetric Allylation of Methyl Ketones by Using Chiral Phenyl Carbinols
作者:Lutz F. Tietze、Tom Kinzel、Thomas Wolfram
DOI:10.1002/chem.200900062
日期:2009.6.15
To methyl or to alkyl? High induced facial selectivities and excellent yields are obtained in the allylation of aliphatic methyl ketones by using a structurally simple phenylbenzyl auxiliary to give the corresponding homoallylic ethers (see scheme). The transferred auxiliary has a very good protecting quality and can easily be removed.
Origin of diastereoselectivity in the addition of allylsilane to chiral acyclic mixed acetals
作者:Kavita Manju、Sanjay Trehan
DOI:10.1039/a904608i
日期:——
Addition of allylsilane to chiral acyclic mixed acetals has been found to proceed via an SN1 mechanism and a model has been proposed to explain the observed diastereoselectivity.
Silyl formates as hydrosilane surrogates for the transfer hydrosilylation of ketones
作者:R. Martin Romero、Neethu Thyagarajan、Nora Hellou、Clément Chauvier、Timothé Godou、Lucile Anthore-Dalion、Thibault Cantat
DOI:10.1039/d2cc00666a
日期:——
A transfer hydrosilylation of ketones employing silyl formates as hydrosilane surrogates under mild conditions is presented. A total of 24 examples of ketones have been successfully converted to their corresponding silyl ethers with 61–99% yields in the presence of a PNHP-based ruthenium catalyst and silyl formate reagent. The crucial role of the ligand for the transformation is demonstrated.
介绍了在温和条件下使用甲硅烷基甲酸酯作为氢化硅烷替代物的酮的转移氢化硅烷化。在 PN H P 基钌催化剂和甲酸甲硅烷酯试剂存在下,共有 24 个酮类实例成功地转化为相应的甲硅烷基醚,产率为 61-99% 。证明了配体对转化的关键作用。