Zinc(<scp>II</scp>)-catalysed transformation of epoxides to aziridines
作者:Dorte Kühnau、Ib Thomsen、Karl Anker Jørgensen
DOI:10.1039/p19960001167
日期:——
The Lewis acid-catalysed transformation of epoxides to aziridines with iminophosphoranes as the nitrogen-fragment donor has been investigated. Of the Lewis acids tested, zinc(II) complexes had the best catalytic properties. The method works best for terminal and cyclic epoxides, internal epoxides being less reactive. Of the various iminophosphoranes employed N-(triphenylphosphoranylidene)-aniline and
Aluminum-Catalyzed Formation of Functional 1,3,2-Dioxathiolane 2-Oxides from Sulfur Dioxide: An Easy Entry towards<i>N</i>-Substituted Aziridines
作者:Victor Laserna、Eddy Martin、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1002/adsc.201600831
日期:2016.12.7
Aluminum(III) complexes derived from aminotriphenolate ligands are shown to be excellent catalysts for the formation of cyclic sulfites from a range of (functionalized) terminal and internal epoxides, and ex situ generated sulfur dioxide. The developed catalytic protocol is characterized by its operational simplicity, wide scope in epoxide reaction partners, good to excellent isolated yields and mild