Asymmetric Synthesis of All Stereoisomers of α-Methylthreonine Using an Organocatalytic Steglich Rearrangement Reaction as a Key Step
作者:Harald Gröger、Friedrich Dietz
DOI:10.1055/s-0029-1217140
日期:——
An efficientsyntheticroute to all four stereoisomers of α-methylthreonine has been established. Each type of stereoisomer has been isolated in diastereomerically pure form and with an enantiomeric excess of at least 86% ee. The key step in this multi-step synthesis is an enantioselective organocatalytic Steglich rearrangement reaction of O-acetylated azlactones. The Steglich rearrangement was also
Cyclic 2-carbonylaminoketones as inhibitors of cruzipain and other cysteine proteases
申请人:——
公开号:US20040127549A1
公开(公告)日:2004-07-01
Compounds of general formula (I), wherein R
1
, R
2
, R
3
, Y, (X)
o
, (W)
n
, (V)
m
, Z and U are as defined in the specification, are inhibitors of cruzipain and other cysteine protease inhibitors and are useful as therapeutic agents, for example in Chagas' disease, or for validating therapeutic target compounds.
1
Moon, Sung-Hwan; Ohfune, Yasufumi, Journal of the American Chemical Society, 1994, vol. 116, # 16, p. 7405 - 7406
作者:Moon, Sung-Hwan、Ohfune, Yasufumi
DOI:——
日期:——
α-Methylserinals as an access to α-methyl-β-hydroxyamino acids: application in the synthesis of all stereoisomers of α-methylthreonine
作者:Alberto Avenoza、Jesús H. Busto、Francisco Corzana、Jesús M. Peregrina、David Sucunza、Marı́a M. Zurbano
DOI:10.1016/j.tetasy.2003.12.001
日期:2004.2
The asymmetric synthesis of all stereoisomers of alpha-methylthreonine using a stereodivergent synthetic route starting from (S)- and (R)-N-Boc-N,O-isopropylidene-alpha-methylserinals is reported. The key step involves the asymmetric addition of methylmagnesium bromide to these aldehydes with a high level of asymmetric induction being observed. This methodology represents a powerful tool for the synthesis of different beta-substituted alpha-methylserines. (C) 2003 Elsevier Ltd. All rights reserved.
Functionalised 2,3-dimethyl-3-aminotetrahydrofuran-4-one and N-(3-oxo-hexahydrocyclopenta[b]furan-3a-yl)acylamide based scaffolds: synthesis and cysteinyl proteinase inhibition
Application of standard methods for the preparation of amino acid alpha-diazomethylketones, through treatment of the mixed anhydride or pre-formed acyl fluorides of intermediates 12-14 with diazomethane, proved troublesome giving complex mixtures. However, the desired alpha-diazomethylketones were isolated and following a lithium chloride/acetic acid promoted insertionreaction provided scaffolds 6-8. Elaboration