Asymmetric hydrogenations of a series of β-amino ketones were carried out with a bimetallic complex (RuPHOX-Ru) as the chiral catalyst. Almost all the reactions (performed in a mixed solvent system of toluene and H2O in the presence of KOH) gave quantitative conversions into their respective products with up to 99.9% ee. The RuPHOX-Ru catalyst is stable to both moisture and air. The procedure has the benefits of being inexpensive, environmentally friendly and highly efficient. Under a relatively low catalyst loading (TON = 2000), key intermediates of fluoxetine, tomoxetine and nisoxetine could be obtained in quantitative yield and in up to 99.9% ee. This methodology represents a promising alternative to the synthesis of the aforementioned drugs and their analogues.
一系列β-
氨基酮的非对称氢化反应是使用双
金属复合物(RuPHOX-Ru)作为手性催化剂进行的。几乎所有反应(在存在KOH的
甲苯和
水的混合溶剂系统中进行)均实现了定量转化,产物的对映体过剩率高达99.9%。RuPHOX-Ru催化剂对
潮湿和空气具有稳定性。该程序具有成本低、环保和高效率的优点。在相对低的催化剂负载下(催化剂转化数 = 2000),可以以定量产率和高达99.9%的对映体过剩率获得
氟西汀、
托莫西汀和
尼索西汀的关键中间体。这种方法为上述药物及其类似物的合成提供了一种有前景的替代方案。