Enantioselective silicon–boron additions to cyclic 1,3-dienes catalyzed by the platinum group metal complexes
作者:Martin Gerdin、Maël Penhoat、Raivis Zalubovskis、Claire Pétermann、Christina Moberg
DOI:10.1016/j.jorganchem.2008.08.029
日期:2008.11
Silaborations of 1,3-cyclohexadiene and 1,3-cycloheptadiene were achieved using catalysts prepared from different combinations of phosphorus ligands and group 10 metal compounds. For the six-membered compound, 1,4-adducts with up to 82% ee were obtained employing Pt(0) and phosphoramidite ligands. For the seven-membered diene optimal conditions were found using catalysts based on Ni(0), but the highest
使用由磷配体和第10族金属化合物的不同组合制备的催化剂实现了1,3-环己二烯和1,3-环庚二烯的硅烷化。对于六元化合物,使用Pt(0)和亚磷酰胺配体可获得ee高达82%的1,4-加合物。对于七元二烯,使用基于Ni(0)的催化剂发现了最佳条件,但观察到的最高选择性仅为22%ee。使用手性甲硅烷基硼烷与手性亚磷酰胺配体结合添加到1,3-环己二烯中,没有获得手性诱导的改善。由环己二烯获得的加合物在微波辐射下用于醛的烯丙基硼化中,以产生具有中等至良好非对映选择性的均烯丙基醇。