Synthesis of a protected derivative of (2R,3R)-β-hydroxyaspartic acid suitable for Fmoc-based solid phase synthesis
作者:Boyaud France、Viguier Bruno、Inguimbert Nicolas
DOI:10.1016/j.tetlet.2012.10.120
日期:2013.1
Synthesis of d-threo-hydroxyaspartic acid, orthogonally protected and compatible with an Fmoc solid-phase peptidesynthesis strategy is reported. This synthetic procedure starting from (2R,3R)-dimethyltartrate is adaptable to a multi-gram scale. 2,2-Dimethyl-5-oxo-1,3-dioxazolane formation between the β-hydroxy alcohol and the β-carboxylic functions constitutes a key step of the differentiation of
Effect of Electron-Withdrawing Substituents on the Epoxide Ring: An Experimental and Theoretical Electron Density Analysis of a Series of Epoxide Derivatives
scrutinized by means of experimental and theoretical electron-density investigations. Due to the possibility of nucleophilic ring-opening, the epoxide ring is not only a very useful functional group in organic synthesis, but acceptor-substituted epoxides are valuable buildingblocks for the design of proteaseinhibitors. Therefore, the electron-density analysis in this work focuses on two main aspects
A revised mechanism for chemoselective reduction of esters with borane-dimethyl sulfide complex and catalytic sodium tetrahydroborate directed by adjacent hydroxyl group
The plausible mechanism for the reduction of the ester groups with a strong preference for one located α to the hydroxyl groups of S-malates and R,R-tartrate-based derivatives has been proposed together with some results with regard to its applications to the syntheses of chiral synthons.
Hydrogen azide-alkylamine combination turned out to ensure the displacement of simple primary or secondary sulfonates, halides, and vicinal disulfonates with an azido-group in which an enhanced reactivity is generally achieved as compared with a case of traditional alkali metal azides.
Novel approach to stereoisomerically full set of optically pure 2,3-epoxyesters from tartaric acids