A new binary acid system featuring an air stable organometallic precursor, titanocene dichloride and a simple Brønsted acid–base compound, was developed. The new catalyst system allowed for mild and highly efficient direct three-component Mannich reactions of both aryl ketones and alkyl ketones, in particular, acetone and its derivatives with excellent yields. Mechanistic study elucidated the dramatic synergistic effect of the new binary acid system.
开发了一种新型的二元酸体系,包含一种空气稳定的有机
金属前驱体——
二氯化钛烯,以及一种简单的布朗斯特酸碱化合物。该新催化剂体系使得
芳香酮和烷基酮,特别是
丙酮及其衍
生物的直接三组分曼尼赫反应能够在温和的条件下高效进行,得到了优异的产率。机制研究阐明了这种新二元酸体系的显著协同效应。