Enzymic aldol condensation/isomerization as a route to unusual sugar derivatives
作者:J. Robert. Durrwachter、Dale G. Drueckhammer、Kenji. Nozaki、H. Marcel. Sweers、Chi Huey. Wong
DOI:10.1021/ja00284a053
日期:1986.11
probes,* and chemical intermediate^.^ A recent review article reflects the importance of these compounds by enumerating hundreds of individual papers in the area of carbohydrate synthesis4 Traditional sources of rare or unnatural sugars have been chemical modification of natural sugars and total synthesis. The former was proven successful in many cases. However, total synthesis has evolved to a very
Aldolases are key biocatalysts for stereoselective C-C bond formation allowing access to polyoxygenated chiral units through direct, efficient, and sustainable synthetic processes. Aldol reaction involving unprotected hydroxypyruvate and an aldehyde...
L-threonine aldolase in organic synthesis: Preparation of novel β-hydroxy-α-amino acids
作者:Vassil P. Vassilev、Taketo Uchiyama、Tetsuya Kajimoto、Chi-Huey Wong
DOI:10.1016/0040-4039(95)00720-w
日期:1995.6
The L-threonine aldolasefromCandidahumicola was used in the synthesis of multifunctional β-hydroxy-α-amino acids. Of many aldehydes with different substituents tested as substrates for reaction with glycine, benzyloxy- and alkoxy-aldehydes are found to be good substrates, providing a new synthetic route to α-amino-β,ω-dihydroxy and α,ω-diamino-β-hydroxy acids. The enzymatic reactions are not stereospecific
Chemoenzymatic Platform for Synthesis of Chiral Organofluorines Based on Type II Aldolases
作者:Jason Fang、Diptarka Hait、Martin Head‐Gordon、Michelle C. Y. Chang
DOI:10.1002/anie.201906805
日期:2019.8.19
addition and demonstrate engineering of the hydroxyl group stereoselectivity. Our aldolase collection is then employed in the chemoenzymatic synthesis of novel fluoroacids and ester derivatives in high stereopurity (d.r. 80-98 %). The compounds made available by this method serve as precursors to fluorinated analogs of sugars, amino acids, and other valuable chiral building blocks.
Additive Pummerer reactions of vinylic sulfoxides. Synthesis of γ-hydroxy-α,β-unsaturated esters, α-hydroxyketones, and 2-phenylsulfenyl aldehydes and primary alcohols
the E-isomers. β-Monosubstituted vinylic sulfoxides 1 possessing a β-aryl group, and β-disubstituted vinylic sulfoxides 3 reacted with trifluoromethanesulfonic anhydride-sodium acetate in acetic anhydride to give 2-(phenylsulfenyl)acylals 14. These gave 2-phenylsulfenyl aldehydes 15 upon basic methanolysis, and the corresponding primary alcohols 16 on reduction with sodium borohydride. Reaction of both