29880-25-9Relevant articles and documents
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Nawa
, p. 237,245 (1938)
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Reactivity of α-Amino Acids in the Reaction with Esters in Aqueous–1,4-Dioxane Media
Kochetova,Kustova,Kuritsyn
, p. 80 - 85 (2018/03/09)
The kinetics of the reaction of a series of α-amino acids with 4-nitrophenyl acetate, 4-nitrophenyl benzoate, and 2,4,6-trinitrophenyl benzoate in aqueous 1,4-dioxane medium has been studied. Kinetics of the reactions involving 4-nitrophenyl acetate and 2,4,6-trinitrophenyl benzoate has complied with the Br?nsted dependence and revealed linear correlation between rate constant logarithm and the energy difference of the frontier orbitals of α-amino acids anions.
Chemo-enzymatic preparation of chiral 3-aminopyrrolidine derivatives
Iding, Hans,Wirz, Beat,Rogers-Evans, Mark
, p. 647 - 653 (2007/10/03)
A new simple method for the enantioselective enzymatic hydrolysis of N-protected D-asparagine esters suitable for the use on the preparative scale is presented. Due to major obstacles observed under conventional reaction conditions - racemization of the retained ester and a strong enzyme inactivation - a comparatively low pH together with an organic co-solvent had to be employed. Under these conditions, nearly all tested proteases demonstrated good activity and excellent enantioselectivity giving access to the corresponding D-esters and L-asparagines in high optical purities (>95% ee) and good chemical yields (>40%). From the unnatural D-asparagine derivative, sequential cyclization, selective deprotection and reduction yielded efficiently benzyl protected (R)-3-aminopyrrolidine, a homo-chiral building block utilized in numerous drug candidates.