Easily assembled, modular N,O-chelating ligands for Ta(V) complexation: a comparative study of ligand effects in hydroaminoalkylation with N-methylaniline and 4-methoxy-N-methylaniline
作者:Pierre Garcia、Philippa R. Payne、Eugene Chong、Ruth L. Webster、Benedict J. Barron、Andrew C. Behrle、Joseph A.R. Schmidt、Laurel L. Schafer
DOI:10.1016/j.tet.2013.04.070
日期:2013.7
The influence of structurally related N,O-chelating ligands with additional heteroatoms (N, O, P, S) on the reactivity of in situ generated tantalum complexes for the hydroaminoalkylation of amines has been explored. Reactivity was probed by evaluating the catalytic ability of these N,O-chelating systems with N-methylaniline and 4-methoxy-N-methylaniline substrates. Enhanced reactivity is observed
研究了结构相关的N,O螯合配体与其他杂原子(N,O,P,S)对原位生成的钽配合物对胺的加氢氨基烷基化反应活性的影响。通过评价这些N,O-螯合系统对N-甲基苯胺和4-甲氧基-N-甲基苯胺底物的催化能力来探测反应性。用在氮上带有邻甲氧基苯基的酰胺配体观察到增强的反应性。发现4-甲氧基-N-甲基苯胺比N更易于通过氢氨基烷基化进行C–H官能化-甲基苯胺。不容许使用相关的底物2-甲氧基-N-甲基苯胺,而是观察到C(sp 3)-O键断裂。