The present invention is a method for the reductive coupling of carbonyl compounds to selectively prepare unsymmetrical alkene(s). In a first step of the method according to the invention, a phosphorus reagent, such as a phosphanylphosphonate, a phosphoranylidenephosphane, or a silylphosphane, is used to convert the first carbonyl compound to a λ3 σ2 phosphaalkene intermediate. This phosphaalkene intermediate is activated by the addition of a base such as hydroxide or alkoxide, potentially under oxidizing conditions, and then reacted with a second carbonyl compound to form the alkene. The first and the second carbonyl compounds may be different from each other, substituted and selected from the group consisting of aldehydes, such as aromatic or aliphatic aldehyde, or ketones, such as aromatic or aliphatic ketones. In such a case, an unsymmetrical alkene is selectively formed. The invention also embraces any alkene compound prepared as taught by the present application. Another aspect of the invention is a kit of parts for the reductive coupling of a first and a second (substituted) carbonyl compound to selectively prepare unsymmetrically substituted alkene(s).
本发明涉及一种用于将羰基化合物还原偶联以选择性地制备不对称
烯烃的方法。根据本发明的方法的第一步,使用
磷试剂,例如
磷基
磷酸酯、
磷基
亚磷酸酯或
硅基
磷烷,将第一羰基化合物转化为λ3 σ2
磷烯中间体。这种
磷烯中间体通过加入碱(如
氢氧化物或烷
氧化物)激活,可能在
氧化条件下,然后与第二羰基化合物反应形成
烯烃。第一和第二羰基化合物可以相互不同,并且可以是取代的,选自醛(如芳香族或
脂肪族醛)或
酮(如芳香族或
脂肪族
酮)的群。在这种情况下,将选择性地形成不对称
烯烃。本发明还涵盖了根据本申请所教授的方法制备的任何
烯烃化合物。本发明的另一个方面是用于将第一和第二(取代的)羰基化合物还原偶联以选择性地制备不对称取代
烯烃的零件组合。