Cyanotrimethylsilane adds to some ⇌,β-unsaturated ketones in conjugate manner under the catalytic action of Lewis acids such as triethylaluminium, aluminiumchloride, and SnCl2. Hydrolysis of the products gives β-cyano ketones which are identical to the hydrocyanated products of the starting enones. The title silicon reagent reacts with acetals and orthoesters under the catalytic action of SnCI2 or BF3-OEt2
Alkylation of acetals using manganate–BF3·OEt2 mixed reagent
作者:Makoto Hojo、Nobuo Ushioda、Akira Hosomi
DOI:10.1016/j.tetlet.2004.04.050
日期:2004.5
ether converted acetals to alkylation products, where an alkoxy group of acetals was substituted by the alkyl group of manganese reagent used. Ketals also reacted with the `mixed reagent' to afford the corresponding alkylation products in high yield. α-Alkoxy-substituted cyclic ethers and acetoxy-substituted cyclic ethers were selectively converted to ring-opening alkylation products and α-alkyl-substituted
仅通过将两种试剂在醚转化的缩醛中搅拌而预先制备的“ R 3 MnMgBr”和BF 3 ·OEt 2的混合物,其中缩醛的烷氧基被所用的锰试剂的烷基取代。缩酮还与“混合试剂”反应,以高收率提供相应的烷基化产物。将α-烷氧基取代的环状醚和乙酰氧基取代的环状醚分别选择性地转化为开环烷基化产物和α-烷基取代的环状醚。
Indirect electrochemical α-methoxylation of aliphatic ethers and acetals - reactivity and regioselectivity of the anodic oxidation using tris(2,4-dibromophenyl)amine as redox catalyst
technically important α-methoxylation of aliphaticethers and acetals to form mixed acetals respectively aldehydes or ortho-esters can be performed electrochemically at low potentials in methanol solution using an undivided cell and tris(2,4-dibromophenyl)amine as redox catalyst. The regioselectivity is usually considerably higher as compared with direct electrolysis in the absence of a catalyst. Especially
Co2(CO)8-Catalyzed Reactions of Acetals or Lactones with Hydrosilanes and Carbon Monoxide. A New Access to the Preparation of 1,2-Diol Derivatives through Siloxymethylation
The Co2(CO)8-catalyzed reaction of acetals with hydrosilanes and CO under mild reaction conditions (an ambient temperature under an ambient CO pressure), leading to the production of vicinal diols ...
Co2(CO)8 催化缩醛与氢硅烷和 CO 在温和反应条件(环境温度和环境 CO 压力)下反应,生成邻二醇...
Monothioacetals are obtained by treating the corresponding acetals with organotin thiophenoxides in the presence of BF2·OEt2. The reaction proceeds under mild conditions to provide the desired compounds with high selectivity.