已经开发了一种二元酸体系,其特征是具有空气稳定性的有机金属前体,二茂钛二氯化物和简单的有机协作布朗斯台德酸,可实现芳基和烷基酮的温和高效的曼尼希反应,并具有优异的收率和令人满意的非对映选择性。机理研究,包括1 H NMR滴定,X射线结构分析以及催化活性物质的分离,阐明了这种新的二元酸体系的巨大协同作用。
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.
AbstractWe found that the trypsin from hog pancreas displayed high activity to promote three‐component Mannich reaction of aromatic aldehydes, aromatic amines, and acetone with moderate‐to‐excellent yields. The reaction tolerates a great range of substrates and extends the application of trypsin in organic synthesis.
Salicylato Titanocene Complexes as Cooperative Organometallic Lewis Acid and Brønsted Acid Catalysts for Three-Component Mannich Reactions
A binary acid system has been developed that features an air‐stable organometallic precursor, titanocene dichloride, and simple organic cooperativeBrønstedacids, which allowed for mild and highly efficient Mannich reactions of both aryl and alkyl ketones with excellent yields and satisfactory diastereoselectivity. Mechanistic studies, including 1H NMR titration, X‐ray structure analyses as well as
已经开发了一种二元酸体系,其特征是具有空气稳定性的有机金属前体,二茂钛二氯化物和简单的有机协作布朗斯台德酸,可实现芳基和烷基酮的温和高效的曼尼希反应,并具有优异的收率和令人满意的非对映选择性。机理研究,包括1 H NMR滴定,X射线结构分析以及催化活性物质的分离,阐明了这种新的二元酸体系的巨大协同作用。