Stereocontrolled transformation of nitrohexofuranoses into cyclopentylamines via 2-oxabicyclo[2.2.1]heptanes. Part 6: synthesis and incorporation into peptides of the first reported 2,3-dihydroxycyclopentanecarboxylic acid
作者:Amalia Estévez、Raquel G. Soengas、Pablo Thomas、Miguel Alegre、Rosalino Balo、Juan Carlos Estévez、Ramón J. Estévez
DOI:10.1016/j.tetasy.2014.03.005
日期:2014.4
Herein we report the intramolecular alkylation of nitronates of methyl-5-O-benzy1-3,6-deoxy-6-nitro-alpha-D-glucofuranoside and methyl-5-O-benzyl-3,6-deoxy-6-nitro-alpha-D-glucofuranoside into the corresponding 2-oxabicyclo[2.2.1]heptane derivatives. Similarly, methyl-3-O-benzy1-5-deoxy-5-nitromethy1-13-beta-D-xylofuranoside and methyl-3-O-benzyl-5-deoxy-5-nitromethyl-alpha-D-xylofuranoside were cyclized to (1R,3R, 45,5R,7R)-7-benzyloxy-3-methoxy-5-nitro-2-oxabicyclo[2.2.1]heptane and (1R,3S,4S,5R,7R)-7-benzyloxy-3-methoxy-5-nitro-2-oxabicyclo[2.2.1]heptane, respectively. These 2-oxabicyclo[2.2.1]heptane derivatives were eventually transformed into enantiopure methyl (15,2S,3R,4S,5R)-2-amino-2,3-dihydroxycyclopentanecarboxylate and this novel beta-amino acid was incorporated into peptides. (c) 2014 Elsevier Ltd. All rights reserved.