Addition of HO-Acids to <i>N</i>
,<i>N</i>
-Bis(oxy)enamines: Mechanism, Scope and Application to the Synthesis of Pharmaceuticals
作者:Yana A. Naumovich、Ivan S. Golovanov、Alexey Yu. Sukhorukov、Sema L. Ioffe
DOI:10.1002/ejoc.201701266
日期:2017.11.9
calculations revealed that solvent affects the reaction pathway. In basic solvents (DMF, NMP, DMSO), N,N-bis(oxy)enamines were converted into nitrosoalkenes by a Lewis base promoted process followed by oxy-Michael addition of the HO-acid. In non-polar solvents (toluene, CH2Cl2), the reaction occurs by an acid-promoted SN′ substitution of the N-oxy-group via a highly reactive N-vinyl-N-alkoxynitrenium species.
[EN] PROCESS FOR PREPARING ALPHA-AMINO ACIDS AND THEIR DERIVATIVES INCLUDING PHENYLALANINE AND HOMOPHENYLALANINE AND THEIR INTERMEDIATES<br/>[FR] PROCÉDÉ D'ÉLABORATION D'ACIDES ALPHA-AMINÉS ET DE LEURS DÉRIVÉS, Y-COMPRIS LA PÉNYLALANINE, L'HOMOPHÉNYLALANINE ET LEURS INTERMÉDIAIRES
申请人:CHEMBIONEX CO LTD
公开号:WO2002012184A1
公开(公告)日:2002-02-14
The invention relates to (D)- or (L)-alpha-amino acids and their derivatives comprising phenylalanine or homophenylalanine having formula (I) or (II) and a process for the preparation thereof by stereoselective synthesis from aziridine having formula (V). The products maintain the stereochemistry of an optically pure aziridine used as starting material, and have many useful applications in industry.