Synthesis of Chiral Aromatic Alcohols: Use of New C<sub>2</sub>-Symmetric Rh<sup>III</sup>Cp∗, Ru<sup>II</sup>(cymene), or Ru<sup>II</sup>(benzene) Complexes Containing Chiral Diaminocyclohexane Ligand as Asymmetric Transfer Hydrogenation Catalyst
作者:Rubén Montalvo-González、Daniel Chávez、Gerardo Aguirre、Miguel Parra-Hake、Ratnasamy Somanathan
DOI:10.1080/00397910802663451
日期:2009.7.7
Abstract Twelve chiral secondary alcohols were synthesized by asymmetric transfer hydrogenation (ATH) using C2-symmetric bis(sulfonamide) ligand (2) derived from (1R,2R)-cyclohexane-1,2-diamine and complexed with [RhCl2Cp*]2, [RuCl2(cymene)]2, or [RuCl2(benzene)]2 and then used in situ in the reduction of prochiral ketones. The alcohols were obtained in 85–99% yield and 90–99% enantioselectivity with
摘要 使用衍生自 (1R,2R)-环己烷-1,2-二胺并与 [RhCl2Cp*]2 络合的 C2-对称双(磺酰胺)配体 (2),通过不对称转移氢化 (ATH) 合成了 12 种手性仲醇, [RuCl2(cymene)]2 或 [RuCl2(苯)]2,然后原位用于还原前手性酮。以异丙醇作为氢源以 85-99% 的收率和 90-99% 的对映选择性获得醇。使用复合物 [RhCl2Cp*]2 和甲酸钠水溶液作为氢源,以 80-99% 的对映选择性实现了两倍的速率提高和更好的产率(88-99%)。