Synthesis of unnatural pentahydroxylated pyrrolizidines: 5-epi- and 5,7a-di-epi-hyacinthacine C1
摘要:
Stereocontrolled synthesis of 5-epi- and 5,7a-di-epi-hyacinthacine C-1 (7 and 8), two potential glycosidase inhibitors are described using alpha,beta-unsaturated ketone 9 as homochiral starting material. The key step in the synthesis is the highly diastereoselective dihydroxylation reaction of 9, that allows the obtention of a single bis-hydroxylated ketone (10). Further derivatization into two epimeric mesylate esters followed by internal cyclization form the pyrrolizidinic compounds 7 and 8. This type of compounds can be useful in glycobiology due to their ability to inhibit carbohydrate-processing enzymes. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of unnatural pentahydroxylated pyrrolizidines: 5-epi- and 5,7a-di-epi-hyacinthacine C1
摘要:
Stereocontrolled synthesis of 5-epi- and 5,7a-di-epi-hyacinthacine C-1 (7 and 8), two potential glycosidase inhibitors are described using alpha,beta-unsaturated ketone 9 as homochiral starting material. The key step in the synthesis is the highly diastereoselective dihydroxylation reaction of 9, that allows the obtention of a single bis-hydroxylated ketone (10). Further derivatization into two epimeric mesylate esters followed by internal cyclization form the pyrrolizidinic compounds 7 and 8. This type of compounds can be useful in glycobiology due to their ability to inhibit carbohydrate-processing enzymes. (C) 2010 Elsevier Ltd. All rights reserved.