Readily available Ti-based <i>in situ</i> catalytic system for oxo/imido heterometathesis
作者:Andrey V. Rumyantsev、Nikolai S. Bushkov、Margarita A. Ryzhikova、Anton A. Zhizhin、Rina U. Takazova、Valeria N. Talanova、Evgenii I. Gutsul、Roman A. Novikov、Pavel A. Zhizhko、Dmitry N. Zarubin
DOI:10.1039/d3dt04388f
日期:2024.3.12
and 2D solid-state NMR, although the proposed imido intermediate has not been detected, pointing towards tris-amides (SiO)Ti(NHC6H4X)3 (X = Me, OMe) being the major surface species in the isolated materials 1a and 1b. The system 1/TolNH2 was tested in a range of imidation reactions and demonstrated excellent performance for express high-yielding preparation of ketimines, formamidines, lactone imidates
我们研究了在 700 °C 脱羟基的二氧化硅上负载的 Ti(NEt 2 ) 4作为一种易于使用的氧代/亚氨基异复分解反应的预催化剂。用 TolNH 2活化后,负载的 Ti 酰胺 ( SiO)Ti(NEt 2 ) 3 ( 1 ) 在酮与N-亚磺酰胺的酰亚胺化中表现出与之前描述的最活跃的明确的酰亚胺催化剂相当的催化活性( 二氧化硅)钛( N t Bu)(Me 2 Pyr)(py) 2 ( 2 ) (Me 2 Pyr = 2,5-二甲基吡咯基),这意味着该系统中表面亚氨基物种的原位形成。 通过IR、EA、 1 H、 13 C、 15 N和2D固态NMR对1用苯胺(TolNH 2 ( 1a )和p -MeOC 6 H 4 15 NH 2 ( 1b ))处理得到的材料进行了研究,尽管尚未检测到所提出的亚氨基中间体,但指向三酰胺( SiO)Ti(NHC 6 H 4 X) 3 (X=Me,OMe)是隔离材料1a和1b中的主要表面物质。系统1