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 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。
Titanocene dichloride and poly(o-aminophenol) as a new heterogeneous cooperative catalysis system for three-component Mannich reaction
A heterogeneous binary acid system featuring an organometallic precusor, titanocene dichloride, and poly(o-aminophenol) as a cooperative Brønsted acid supporter was developed.
Cellulose-supported ionicliquidphase (SILP) catalystcontaining a camphor sulfonate anion with a pendant ferrocenyl group was prepared and characterised with different analytical techniques such as Fourier-transform infrared, Fourier-transform Raman, and cross polarization–magic angle spinning (CP-MAS) 13C NMR spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis
制备了带有樟脑烯基侧基的樟脑磺酸根阴离子的纤维素负载离子液相催化剂,并采用不同的分析技术进行了表征,如傅立叶变换红外光谱,傅立叶变换拉曼光谱和交叉极化-魔角纺丝(CP- MAS)13 C NMR光谱,X射线衍射,扫描电子显微镜和热重分析。SILP催化剂在通过曼尼希反应合成β-氨基羰基化合物中显示出优异的催化活性。回收研究表明,SILP催化剂可以重复使用六次,而催化活性不会显着降低。