Asymmetric synthesis of the l-fuco-nojirimycin, a nanomolar α-l-fucosidase inhibitor
作者:Mathieu Dubernet、Albert Defoin、Céline Tarnus
DOI:10.1016/j.bmcl.2005.11.100
日期:2006.3
We describe the asymmetric synthesis of the 5-amino-5-deoxy-L-fucose (L fuco-nojirimycin) which appears as a very potent fucosidase inhibitor with a K-1 value of 1 nM. (C) 2005 Elsevier Ltd. All rights reserved.
Chiral Diels–Alder reaction between cyclopentadiene and nitroso derivatives: thermal isomerisation/racemisation of the adducts
Cyclopentadiene nitroso adducts 1a and ent-1a were synthesised in good yields and good enantiomeric excess from chiral chloro-nitroso derivatives 4 and 5 in the d-mannose and d-ribose series, respectively. The thermal racemisation of these adducts occurred below room temperature. Some other chiral Diels–Alder nitroso adducts were prepared in the d-mandelic, l-prolinol and d-O-methylprolinol series
Crystalline 5-O-acetyl-2,3-isopropylidenedioxy-d-ribonolactone oxime (8) was synthesised from d-ribose in 40% overall yield. The chloronitroso dienophile 3b was obtained from 8 by oxidation with t-BuOCl and underwent asymmetric Diels-Alder reaction with cyclic and acyclic dienes 10-13 to give crystalline adducts 14a-17a in good yield and excellent enantiomeric excess (93-99%).