Hetero Diels-Alder reaction involving (E)-3-(tert-butyldimethylsiloxy)-1-(2′,3′,4′,6′-tetra- O-acetyl-β-d-glucopyranosyloxy)buta-1,3-diene and p-nitrobenzaldehyde
摘要:
The title reaction, when carried out in carbon tetrachloride in the presence of a catalytic amount of Eu(fod)(3), leads mainly to the cis-cycloadduct 6a; the product undergoes isomerisation to its epimer 7a in the presence of the catalyst in dichloromethane.
Dirhodium(II) Tetrakis[N-benzene-fused Phthaloyl-(S)-piperidinonate] as a Chiral Lewis Acid: Catalytic Enantioselective Aldol Reactions of Acetate-derived Silylketene Acetals and Aldehydes
Asymmetric Synthesis of Both Antipodes of β-Hydroxy Nitriles and β-Hydroxy Carboxylic Acids via Enzymatic Reduction or Sequential Reduction/Hydrolysis
作者:Haribabu Ankati、Dunming Zhu、Yan Yang、Edward R. Biehl、Ling Hua
DOI:10.1021/jo802495f
日期:2009.2.20
afforded (R)- or (S)-β-hydroxy nitriles with excellent optical purity and yield. Subsequently, nitrilase-catalyzedhydrolysis of the obtained optically pure β-hydroxy nitriles led to the corresponding β-hydroxy carboxylic acids in high yields. More importantly, the sequential enzymatic reduction and hydrolysis could be carried out in “two-step-one-pot” fashion without the isolation of intermediates β-hydroxy
Hetero Diels-Alder reaction involving (E)-3-(tert-butyldimethylsiloxy)-1-(2′,3′,4′,6′-tetra- O-acetyl-β-d-glucopyranosyloxy)buta-1,3-diene and p-nitrobenzaldehyde
作者:Richard F. Lowe、Richard J. Stoodley
DOI:10.1016/s0040-4039(00)73430-7
日期:1994.8
The title reaction, when carried out in carbon tetrachloride in the presence of a catalytic amount of Eu(fod)(3), leads mainly to the cis-cycloadduct 6a; the product undergoes isomerisation to its epimer 7a in the presence of the catalyst in dichloromethane.