<i>N-</i>Tosyloxycarbamates as a Source of Metal Nitrenes: Rhodium-Catalyzed C−H Insertion and Aziridination Reactions
作者:Hélène Lebel、Kim Huard、Sylvain Lectard
DOI:10.1021/ja0552850
日期:2005.10.1
N-tosyloxycarbamates to generate metal nitrenes which undergo intramolecular C-H insertion or aziridination reaction is described. Aliphatic N-tosyloxycarbamates produce oxazolidinones with high yields and stereospecificity through insertion in benzylic, tertiary, and secondary C-H bonds. Intramolecular aziridination occurs with allylic N-tosyloxycarbamates to produce aziridines as single diastereomers
Regio- and stereoselective synthesis of N-H aziridines N-N bond reduction ofN-quinazolinylaziridines
作者:Ali Koohang、Corey L. Stanchina、Robert M. Coates
DOI:10.1016/s0040-4020(99)00522-0
日期:1999.8
nerol, and(E,E)-farnesol— with Atkinson'sN-acetoxyamino-2-ethyl-4(3H)-quinazolonereagent (4) affordedN-substituted2,3-epimino alcohols. Reduction of these and relatedN-substitutedaziridines with metal-ammonia or lithium-naphthalenide reagents furnished a series of N-H aziridino alcohols (53–74%) including 2,3- and 6,7-epimino geraniols (10 and13), 2,3-epimino nerol (17),(E,E)-2,3-epiminofarnesol (23)
A general method for synthesizing opticallyactive, primary, secondary, and tertiary organofluorides was developed. This chiral pool synthesis utilized the skeleton of arabinose to generate diastereomerically pure 2-oxazolidinone-fused aziridines, which underwent ring opening with a fluoride anion. The adducts, polyoxygenated organofluorides, were useful precursors to various fluorinated compounds
Pyridine copper complexes were found as active catalysts for the intramolecular aziridination of allylic N-tosyloxycarbamates and the intermolecular aziridination of styrenes with trichloroethyl N-tosyloxycarbamates. Free aziridines were easily obtained by basic deprotection of the trichloroethyl group.