Asymmetric Synthesis of Fluoroamines from Chiral Aziridines
作者:Hyeonjeong Park、Doo-Ha Yoon、Hyun-Joon Ha、Se In Son、Won Koo Lee
DOI:10.5012/bkcs.2014.35.3.699
日期:2014.3.20
E-mail: wonkoo@sogang.ac.krReceived September 18, 2013, Accepted November 26, 2013Key Words : Fluoroamine, Chiralaziridine, Ring-opening reaction, Triethylamine trihydrofluorideThe fluorinated organic molecules have attracted greatattentions from synthetic and medicinal chemists with wideuse of various agrochemicals and pharmaceuticals.
In this study, the highly strained three-membered aziridinering was successfully activated as the aziridinium ion by alkylation of the ring nitrogen with a methyl, ethyl or allyl group, which was followed by ringopening with external nucleophiles such as acetate and azide. Such alkylative aziridineringopening provides an easy route for the synthesis of various N-alkylated amine-containing molecules
A novel dynamic kinetic resolution accompanied by intramolecular transesterification: asymmetric synthesis of a 4-hydroxymethyl-2-oxazolidinone from serinol derivatives
Reaction paths of the one-pot reaction of (R)-2-(alpha-methylbenzyl)amino-1,3-propanediol (1) and 2-chloroethyl chloroformate with DBU giving (4S,alphaR)-4-hydroxymethyl-3-(alpha-methylbenzyl)-2-oxazolidinone [(4S)-2] (94% de) were investigated. Intermediates of this reaction, 2-chloroethyl (2S)- and 2-chloroethyl (2R)-3-hydroxy-2-[(alphaR)-alpha-methylbenzyl]aminopropyl carbonates [(2S)-4 and (2R)-4], were synthesized individually. After the addition of DBU to the respective solution of the carbonate (2S)-4 and that of (2R)-4 in dichloromethane, the intramolecular transesteritication between (2S)-4 and (2R)-4 and the diastereoselective intramolecular cyclization proceeded to afford (4S)-2 in high diastereomeric excess. Therefore, two monocarbonates (2S)-4 and (2R)-4 were kinetically resolved by this cyclization during the intramolecular transesterification between (2S)-4 and (2R)-4. We found that this process involved dynamic kinetic resolution accompanied by intramolecular transesterification. (C) 2003 Elsevier Science Ltd. All rights reserved.