Chiral rare earth metal complex-catalyzed conjugate addition of O-alkylhydroxylamines. An efficient synthetic entry into optically active 2-acyl aziridines
Tertiary amine-promoted enone aziridination: investigations into factors influencing enantioselective induction
作者:Alan Armstrong、Robert D.C. Pullin、Chloe R. Jenner、Klement Foo、Andrew J.P. White、James N. Scutt
DOI:10.1016/j.tetasy.2013.11.008
日期:2014.1
synthesised (up to 77% ee) via a chiral tertiary amine-promoted nucleophilic aziridination of α,β-unsaturated ketones utilising in situ generated N–N ylides (aminimines). A wide range of chiral tertiary amines were synthesised and evaluated, allowing structure–activity relationships to be drawn. The most efficient promoter for asymmetric aziridination, quinine, was assessed with several enones to ascertain
binaphthalene-based tertiary amines have been used for the asymmetric aziridination of chalcone, providing N-unprotected aziridines with ee values of up to 43%. A chiral hydrazinium salt has been isolated for the first time and shown to provide similar yield and enantioselectivity to the in situ process in reaction with chalcone.
原位衍生自许多对映异构纯的联萘叔胺的胺已用于查耳酮的不对称氮丙啶化,提供 N-未保护的氮丙啶,其 ee 值高达 43%。首次分离出手性肼盐,并显示出与原位与查耳酮反应过程相似的产率和对映选择性。
One-pot synthesis of γ-lactams from ketoaziridines
作者:Lorena S. R. Martelli、Otavio A. M. da Silva、Julio Zukerman-Schpector、Arlene G. Corrêa
DOI:10.1039/d3ob01568h
日期:——
The remarkable biological activities of γ-lactams have stimulated the search for efficient synthetic methods to achieve these scaffolds. In this work, we have developed a simple one-pot diastereoselective synthesis of new γ-lactams from ketoaziridines with moderate to good yields via the Horner–Wadsworth–Emmons reaction, followed by an intramolecular ester-aziridine cyclization and its opening in situ