Asymmetric synthesis of potent glycosidase and very potent α-mannosidase inhibitors: 4-amino-4-deoxy-l-erythrose and 4-amino-4,5-dideoxy-l-ribose
摘要:
Pyrrolidine amino-sugars, cyclic iminoalditols as well as linear aminoalditols in 4-amino-L-erythrose and 4-amino-5-deoxy-L-ribose series were synthesised by asymmetric hetero-Diels-Alder reaction followed by chemical transformations. 4-Amino-4-deoxy-L-erythrose and 4-amino-4,5-dideoxy-L-ribose were potent beta-D-glucosidase, alpha-D-mannosidase, alpha- and beta-D-galactosidase inhibitors. We have shown that the ribose derivative was a very potent inhibitor of alpha-D-mannosidase. (C) 2003 Elsevier Science Ltd. All rights reserved.
Diels-Alder (HDA) and enereactions. Methods: Acylnitroso intermediates were readily obtained by hydrogen peroxide oxidation of hydroxamic acids catalyzed by Cu(I)-, Ir(I)- or Ru(II)-complexes and easily reacted with symmetric and asymmetric conjugated dienes beside their reaction with different alkenes which converted to biological active products. Results: The resulted acylnitroso intermediates were efficiently
Asymmetric Diels-Alder reaction of the N-dienyl-L-pyroglutamic esters 1a-h with acyl nitroso dienophiles 4a-h gave diastereoisomeric adducts 6a-n, 7a-n with 12–90 % de, depending on solvents and temperature. An interpretation was gived. The “allylic effect” ( MO interactions) was found to be effective to account for the conformations of the adducts.
Pyrrolidine amino-sugars, cyclic iminoalditols as well as linear aminoalditols in 4-amino-L-erythrose and 4-amino-5-deoxy-L-ribose series were synthesised by asymmetric hetero-Diels-Alder reaction followed by chemical transformations. 4-Amino-4-deoxy-L-erythrose and 4-amino-4,5-dideoxy-L-ribose were potent beta-D-glucosidase, alpha-D-mannosidase, alpha- and beta-D-galactosidase inhibitors. We have shown that the ribose derivative was a very potent inhibitor of alpha-D-mannosidase. (C) 2003 Elsevier Science Ltd. All rights reserved.