α-Alkylation versus retro-O-Michael/γ-alkylation of bicyclic N,O-acetals: an entry to α-methylthreonine
摘要:
The synthesis of a new threonine equivalent based on a bicyclic N,O-acetal substructure incorporating four stereogenic centres is developed from Boc-L-threonine methyl ester in one step. Its use as an excellent chiral building block was demonstrated in a new diastereoselective synthesis of alpha-methylthreonine by an alpha-alkylation reaction and in the synthesis of chiral alpha,beta-dehydroamino acid derivatives, using the tandem retro-O-Michael/gamma-alkylation reactions as key steps. (C) 2008 Elsevier Ltd. All rights reserved.
α-Alkylation versus retro-O-Michael/γ-alkylation of bicyclic N,O-acetals: an entry to α-methylthreonine
摘要:
The synthesis of a new threonine equivalent based on a bicyclic N,O-acetal substructure incorporating four stereogenic centres is developed from Boc-L-threonine methyl ester in one step. Its use as an excellent chiral building block was demonstrated in a new diastereoselective synthesis of alpha-methylthreonine by an alpha-alkylation reaction and in the synthesis of chiral alpha,beta-dehydroamino acid derivatives, using the tandem retro-O-Michael/gamma-alkylation reactions as key steps. (C) 2008 Elsevier Ltd. All rights reserved.
作者:Carlos Aydillo、Alberto Avenoza、Jesús H. Busto、Gonzalo Jiménez-Osés、Jesús M. Peregrina、María M. Zurbano
DOI:10.1021/ol203068s
日期:2012.1.6
The asymmetric sulfa-Michael additions of appropriately protected l- and d-cysteine derivatives to new chiral dehydroamino acid derivatives have been developed as key steps in the synthesis of biologically important cysteine derivatives, such as lanthionine (Lan) and β-methyllanthionine (MeLan), which are unusual bis-α-amino acids found in the emerging lantibiotics such as nisin.
α-Alkylation versus retro-O-Michael/γ-alkylation of bicyclic N,O-acetals: an entry to α-methylthreonine
作者:Carlos Aydillo、Alberto Avenoza、Jesús H. Busto、Gonzalo Jiménez-Osés、Jesús M. Peregrina、María M. Zurbano
DOI:10.1016/j.tetasy.2008.11.031
日期:2008.12
The synthesis of a new threonine equivalent based on a bicyclic N,O-acetal substructure incorporating four stereogenic centres is developed from Boc-L-threonine methyl ester in one step. Its use as an excellent chiral building block was demonstrated in a new diastereoselective synthesis of alpha-methylthreonine by an alpha-alkylation reaction and in the synthesis of chiral alpha,beta-dehydroamino acid derivatives, using the tandem retro-O-Michael/gamma-alkylation reactions as key steps. (C) 2008 Elsevier Ltd. All rights reserved.