Synthesis of γ-Azido-β-ureido Ketones and Their Transformation into Functionalized Pyrrolines and Pyrroles via Staudinger/aza-Wittig Reaction
作者:Anastasia A. Fesenko、Anatoly D. Shutalev
DOI:10.1021/jo302724y
日期:2013.2.1
The synthesis includes three-component condensation of acetals of 2-azidoaldehydes with urea or methylurea and p-toluenesulfinic acid in aqueous formic acid followed by reaction of the obtained N-[(2-azido-1-tosyl)alkyl]ureas with sodium enolates of α-functionalized ketones. The azido ketones or their cyclic isomers are transformed into ureido-substituted Δ1- or/and Δ2-pyrrolines viaStaudinger/aza-Wittig
Substrate Specificity and Stereoselectivity of Two <i>Sulfolobus</i>
2-Keto-3-deoxygluconate Aldolases towards Azido-Substituted Aldehydes
作者:Marloes Schurink、Suzanne Wolterink-van Loo、John van der Oost、Theo Sonke、Maurice C. R. Franssen
DOI:10.1002/cctc.201300785
日期:2014.4
their natural reaction. However, if a set of azido‐functionalized aldehydes were applied as alternative acceptors in the reaction with pyruvate, the stereoselectivity was strongly increased to give enantiomeric or diastereomeric excess values up to 97 %. The Sulfolobus acidocaldarius KDGA displayed a higher stereoselectivity than Sulfolobus solfataricus KDGA for all tested reactions. The azido‐containing