Strecker reactions of various aldimines as well as ketoimines with TMSCN proceeded smoothly under mild conditions to give the corresponding alpha-amino nitriles and alpha,alpha-disubstituted alpha-amino nitriles, respectively, in good to excellent yields in the presence of nanocrystalline magnesium oxide. The reaction proceeds through hypervalent silicate species by coordination to O2-/O- (Lewis basic site) of nanocrystalline magnesium oxide, proved by Si-29 NMR. (C) 2008 Elsevier Ltd. All rights reserved.
The first catalytic asymmetric cycloadditions of imines with an enolisable anhydride
作者:Sarah A. Cronin、Aarón Gutiérrez Collar、Sivaji Gundala、Claudio Cornaggia、Esther Torrente、Francesco Manoni、Astrid Botte、Brendan Twamley、Stephen J. Connon
DOI:10.1039/c6ob00048g
日期:——
The first catalytic, asymmetric reactions of imines with homophthalic anhydride to form disubstituted 3,4-dihydroisoquinolones are reported. The use of N-mesyl aldimines is key, as more basic imines undergo rapid uncatalysed reactions, while imines possessing larger N-sulphonyl substituents form lactams with lower ee.