Hydrosilylation of cinchonidine and 9-O-TMS-cinchonidine with triethoxysilane: application of 11-(triethoxysilyl)-10,11-dihydrocinchonidine as a chiral modifier in the enantioselective hydrogenation of 1-phenylpropane-1,2-dione
作者:Anna Lindholm、Päivi Mäki-Arvela、Esa Toukoniitty、Tapani A. Pakkanen、Janne T. Hirvi、Tapio Salmi、Dmitry Yu. Murzin、Rainer Sjöholm、Reko Leino
DOI:10.1039/b205032c
日期:——
The detailed synthesis and characterization of (−)-11-(triethoxysilyl)-10,11-dihydrocinchonidine (4), a starting material for the immobilization of (−)-cinchonidine on silica based supports, is described. Compound 4 together with its precursors 9-O-(trimethylsilyl)cinchonidine (2) and 9-O-(trimethylsilyl)-11-(triethoxysilyl)-10,11-dihydrocinchonidine (3) were employed as chiral modifiers in the hydrogenation
描述了详细的合成和表征(-)-11-(triethoxysilyl)-10,11-dihydrocinchonidine(4),一种用于将(-)- inchinchidine固定在基于二氧化硅的载体上的原料。化合物4及其前体9- O-(三甲基甲硅烷基)辛可尼定(2)和9- O-(三甲基甲硅烷基)-11-(三乙氧基甲硅烷基)-10,11-二氢辛可尼定(3)用作手性修饰剂使用辛可尼定(1)作为参考改性剂,在非均相Pt / Al 2 O 3催化剂上制备前手性二酮1-苯基丙烷-1,2-二酮。4引起的ee的意外增强分子建模和NMR研究讨论了表明远端修饰剂取代的积极作用的方法。