Chemistry of Aziridine Carboxylic Acids, 7. Synthesis of Ethyl (2R,3S)-N-Boc- and -N-Benzyl-3-vinylaziridine-2-carboxylates: New Potential Building Blocks for Enantiomerically Pure Unsaturated Amino Acids
作者:Klaus Jähnisch
DOI:10.1002/jlac.199719970419
日期:1997.4
Enantiomericallypure cis- and trans-1H-aziridine-carboxylic acid derivatives 2a, b and 3a, b have been prepared by asymmetric Michael-type addition of ammonia to chiral acrylates 1a, b with high syn selectivity. The title compounds were obtained from the diols 8a, b by Corey-Winter olefination.
Hydrogenation of 1-benzyl-aziridine-2-carboxylic acid ethyl ester 1 yielded the enantiomerically pure 1H-aziridine 2 or the beta-amino acid ester 3 as main products depending on the reaction time. The Z-protected derivatives of 2 and 3 were transformed into the gamma-lactones 4 and 5, respectively.
The Ring Expansions of Glyceraldehyde-Derived Aziridine-2-carboxylates to Oxazolines Take Place with an Uncommon Regiochemistry
Aziridination of Chiral 3-(2,2-Dimethyl-1,3-dioxolan-4-yl)-2-propenoate Esters
作者:Antonello Fazio、M.Antonietta Loreto、Paolo A Tardella、Daniela Tofani
DOI:10.1016/s0040-4020(00)00293-3
日期:2000.6
The reactions of chiral 3-(2,2-dimethyl-1,3-dioxolan-4-yl)-2-propenoate esters 2-5 with NsONHCO(2)Et and CaO, produce the aziridine derivatives by addition of (ethoxycarbonyl)amino group on the double bond. The stereoselectivity is good for trans substrates. Products are precursors to polyhydroxy amino acids.double dagger (C) 2000 Elsevier Science Ltd. All rights reserved.