Asymmetric synthesis of the l-fuco-nojirimycin, a nanomolar α-l-fucosidase inhibitor
摘要:
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.
Cycloaddition of chiral nitroso derivatives with cyclohepta-1,3-diene gave one single stereoisomer with an excellent selectivity. The structures including absolute configurations have been assigned by spectroscopy and X-ray crystallography. These studies have been applied to the total synthesis of the naturally occurring calystegine B2.
手性亚硝基衍生物与环庚-1,3-二烯的环加成反应产生了一种具有优异选择性的单一立体异构体。包括绝对构型在内的结构已通过光谱学和X射线晶体学确定。这些研究已经应用于天然存在的calystegine B 2的全合成。
[EN] PROCESS FOR THE PREPARATION OF (1S,4R)-2-OXA-3-AZABICYCLO[2,2.1]HEPT-5-ENES<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE (1S, 4R)-2-OXA-3-AZABICYCLO[2,2.1]HEPT-5-ÈNES
申请人:LONZA AG
公开号:WO2011023374A1
公开(公告)日:2011-03-03
Enantiomerically enriched (1 S,4R)-2-oxa-3-azabicyclo[2.2.1]hept-5-ene of formula wherein PG1 is an amino-protective group, are prepared from cyclopentadiene via hetero-Diels-Alder cycloaddition with protected 1-C-nitroso-β-D-ribofuranosyl halides of formula wherein X is a halogen atom selected from fluorine, chlorine, bromine and iodine, PG2 is a hydroxyl-protective group and PG3 is a 1,2-diol-protective group.