Studies on the aza-Claisen rearrangement of 4,5-dihydroxylated allylic trichloroacetimidates: the stereoselective synthesis of (2R,3S)- and (2S,3S)-2-amino-3,4-dihydroxybutyric acids
摘要:
Two new synthetic approaches, involving substrate directed aza-Claisen rearrangements and aza-Claisen rearrangements mediated by chiral Pd(II) catalysts, have been developed for the stereoselective synthesis of (2R,3S)-2-amino-3,4-dihydroxybutyric acid, a dihydroxylated alpha-amino acid from the edible mushroom, Lyophyllum ulmarium and its (2S,3S)-unnatural diastereomer. (C) 2008 Elsevier Ltd. All rights reserved.
The intramolecularconjugateaddition of allylically situated carbamoyloxy group to properly substituted heteroolefin proceeds with complete 1,2-syn diastereoselectivity, which culminates in a highlystereoselective new synthesis of syn-β-hydroxy-α-amino acids.
Diastereoselective Strecker reaction of D-glyceraldehyde derivatives. A novel route to (2S,3S)- and (2R,3S)-2-amino-3,4-dihydroxybutyric acid
作者:Carlos Cativiela、María D. Día-de-Villegas、JoséA. Gálvez、JoséI. García
DOI:10.1016/0040-4020(96)00493-0
日期:1996.7
Efficient and stereoselective synthetic routes to enantiomerically pure (2R,3S)- and (2R,3S)-2-amino-3,4-dihydroxybutyricacid have been developed using the stereoselective Strecker type reaction of carbonyl compounds derived from appropriately protected D-glyceraldehyde. The stereoselectivity of the cyanide addition was shown to be dependent on the presence of metal complexing agents, which is essential
Diastereoselective Strecker reaction of imines derived from D-glyceraldehyde. A new route to β-hydroxy-α-amino acids
作者:Carlos Cativiela、María D. Díaz-de-Villegas、JoséA. Gálvez
DOI:10.1016/0040-4039(95)00367-l
日期:1995.4
A diastereoselective Strecker type reaction of iminesderivedfrom conveniently protected D-glyceraldehyde has been achieved with good to excellent stereoselectivity through an appropriate choice of the protecting group and reaction conditions