Catalytic and enantioselective aza-ene and hetero-Diels–Alder reactions of alkenes and dienes with azodicarboxylates
作者:Pompiliu S. Aburel、Wei Zhuang、Rita G. Hazell、Karl Anker Jørgensen
DOI:10.1039/b503744a
日期:——
Lewis acids such as Cu(OTf)(2), Zn(OTf)(2), Yb(OTf)(3) and Nd(OTf)(3) catalyze the aza-ene reaction of alkenes with azodicarboxylates, giving the allylic amination adducts. The use of bis(2,2,2-trichloroethyl)azodicarboxylate as the amination reagent and Cu(OTf)(2) and Yb(OTf)(3) as the catalysts gave the aza-ene reaction of different alkenes, leading to the corresponding allyl amines in high yields
Catalytic Enantioselective Amination of Enolsilanes Using <i>C</i><i><sub>2</sub></i>-Symmetric Copper(II) Complexes as Chiral Lewis Acids
作者:David A. Evans、Douglas S. Johnson
DOI:10.1021/ol990113r
日期:1999.8.1
[formula: see text] [Cu(S,S)-t-Bu-box](OTf)2 (1) catalyzes the enantioselective amination of enolsilanes with azodicarboxylate derivatives. Isomerically pure enolsilanes of aryl ketones, acylpyrroles, and thioesters added to the azo-imide in greater than 95% ee. The use of an alcohol additive was critical to achieving catalyst turnover.