Asymmetric synthesis of (5S)-4-deoxy-5-C-(4-nitrophenyl)-l-threo-pentose and (5R)-5-C-(4-nitrophenyl)-l-arabinose
摘要:
In the presence of Eu(fod)(3), (1E)-(2',3',4',6'-tetra-O-acetyl-beta-D-glucopyranosyloxy)buta-1,3-diene and its (3Z)-4-O-acetyl derivative undergo Re-face and endo selective hetero Diels-Alder reactions with 4-nitrobenzaldehyde, 5-nitrofuran-2-carbaldehyde and 5-nitrothiophene-2-carbaldehyde. The cycloadducts are converted into the title compounds, early examples of 'free' 5-C-arylpentopyranoses. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis of (5S)-4-deoxy-5-C-(4-nitrophenyl)-l-threo-pentose and (5R)-5-C-(4-nitrophenyl)-l-arabinose
摘要:
In the presence of Eu(fod)(3), (1E)-(2',3',4',6'-tetra-O-acetyl-beta-D-glucopyranosyloxy)buta-1,3-diene and its (3Z)-4-O-acetyl derivative undergo Re-face and endo selective hetero Diels-Alder reactions with 4-nitrobenzaldehyde, 5-nitrofuran-2-carbaldehyde and 5-nitrothiophene-2-carbaldehyde. The cycloadducts are converted into the title compounds, early examples of 'free' 5-C-arylpentopyranoses. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.