Direct Amino Acid-Catalyzed Asymmetric Desymmetrization of meso-Compounds: Tandem Aminoxylation/O−N Bond Heterolysis Reactions
摘要:
A practical organocatalytic process for the synthesis of optically active, highly substituted (x-hydroxy-ketones was achieved through asymmetric desymmetrization (ADS) of prochiral ketones. The ADS and O-N bond reduction reaction of prochiral ketone with nitrosobenzene in the presence of a catalytic amount of chiral amine or amino acid produced the tandem ADS/O-N bond reduced products as single diastereomers with good yields and excellent enantiomeric excesses.
Sodium Acetate Catalyzed Multicomponent Cyclization of Aromatic Aldehydes, Acetone and Meldrum Acid
作者:Lin An、Feng Yang、Rong Yao、Chaoguo Yan
DOI:10.1002/cjoc.201190020
日期:2010.12
The sodium acetate catalyzed three‐component reaction of aromatic aldehyde, acetone and Meldrum acid or spirolactone at room temperature gave stereospecific 7,11‐cis‐diaryl‐2,4‐dioxaspiro[5,5]undecane‐1,5,9‐triones in a very efficient manner.