The base-promoted isomerization of aziridines to allyl amines is still an almost unknown reaction. However, the use of superbasic reagents has shown to be able to promote a regio- and stereoselective conversion of monocyclic and bicyclic sulfonyl aziridines. Moreover, the use of alkoxy substituted aziridines opens new routes to non-natural alpha- and beta-amino acids. (C) 2002 Elsevier Science Ltd. All rights reserved.
The Enantioselective Synthesis of ?-Amino Acids, their ?-hydroxy derivatives, and theN-terminal components of bestatin and microginin
作者:Charles W. Jefford、James McNulty、Zhi-Hui Lu、Jian Bo Wang
DOI:10.1002/hlca.19960790426
日期:1996.6.26
(3R)-3-aminobutanoic acids 12a–e (ee > 99%). Electrophilic hydroxylation of 8 ( 19; Scheme 3), subsequent iodo-esterification ( 21; Scheme 4), and nucleophilic alkylation and phenylation afforded, after saponification and deprotection, a series of 4-substituted (2S, 3R)-3-amino-2-hydroxybutanoic acids 24 including the N-terminal acids 24e ( =3) and 24f ( =4) of bestatin and microginin (de > 95%), respectively
Base promoted isomerization of aziridinyl ethers: a new access to α- and β-amino acidsElectronic supplementary information (ESI) available: experimental procedures and NMR data. See http://www.rsc.org/suppdata/cc/b2/b200708h/.
Aziridinyl ethers are selectively and easily converted to either amino vinyl ethers or alkoxy allylamines by treatment with mixed metal bases (superbases).