Stereoselective Syntheses of 4-Oxa Diaminopimelic Acid and Its Protected Derivatives via Aziridine Ring Opening
作者:Hongqiang Liu、Vijaya R. Pattabiraman、John C. Vederas
DOI:10.1021/ol701742x
日期:2007.10.1
Regio- and stereoselective aziridine ring opening with oxygen nucleophiles derived from serine and threonine provides a route to stereochemically pure 4-oxa-2,6-diaminopimelic acid (oxa-DAP) and its methyl-substituted derivatives. Oxa-DAP is a substrate of DAP epimerase, a key enzyme for biosynthesis of l-lysine and formation of peptidoglycan precursors. Orthogonally protected analogues of lanthionine
Synthesis of orthogonally protected 1,2-diaminopropanoic acids by ring-opening of 3-unsubstituted N-activated aziridine 2-carboxylates with para-methoxybenzylamine: a study of the regioselectivity of the reaction
作者:Keith O’Brien、Fintan Kelleher
DOI:10.1016/j.tetlet.2013.09.116
日期:2013.11
Orthogonally protected 1,2-diaminopropanoic acids (DAPs) have been synthesised in good yields by the ring-opening of 3-unsubstituted N-activated aziridine 2-carboxylates with para-methoxybenzylamine. The choice of both the N-activating group and ester alkyl group had a significant influence on the ratio of attack at the α or β positions of the aziridine. However, the regiochemical outcome is not predictable
Synthesis of orthogonally protected azalanthionines (lanazanines) by sequential ring-opening of N-substituted aziridine 2-carboxylates
作者:Keith O’Brien、Keith ó Proinsias、Fintan Kelleher
DOI:10.1016/j.tetlet.2013.02.096
日期:2013.5
Orthogonally protected azalanthionines (lanazanines, 4-azadiaminopimelic acids or beta-aminoalaninoalanines) have been synthesised in good yields by the ring-opening of N-protected aziridine 2-carboxylates with suitably protected diaminopropanoic acids (DAPs). The required DAPs were also synthesised by ring-opening of N-protected aziridine 2-carboxylates with para-methoxybenzylamine. (C) 2013 Elsevier Ltd. All rights reserved.
Studies on the synthesis of orthogonally protected azalanthionines, and of routes towards β-methyl azalanthionines, by ring opening of N-activated aziridine-2-carboxylates
作者:Keith O'Brien、Keith ó Proinsias、Fintan Kelleher
DOI:10.1016/j.tet.2014.06.011
日期:2014.8
Orthogonally protected azalanthionines were successfully synthesised by the ring-opening of N-activated aziridine-2-carboxylates with protected diaminopropanoic acids (DAPs). The required DAPs were also prepared by ring-opening of N-activated aziridine-2-carboxylates with para-methoxybenzylamine, but it was found that the choice of aziridine protecting groups dictated both the success of the reaction as well as the regioselectivity of the isolated products. Attempts to extend the methodology to the preparation of the more sterically demanding beta-methyl azalanthionines have, so far, been unsuccessful. (C) 2014 Elsevier Ltd. All rights reserved.