CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishConcise syntheses of two enantiomeric tetrahydroxyquinolizidines, 10 and ent-10, have been achieved from D-arabinose and L-arabinose, respectively. Highly diastereoselective homologation of imine 5 (or ent-5) using 2-(trimethylsiloxy)furan provided the nine-carbon butenolide 6 (or ent-6) which was elaborated into the quinolizidine 10 (or ent-10) via a clean sequence involving, as key operations, DBU-promoted γ-lactone to δ-lactam ring expansion (e.g. 7 to 8) and cyclodehydration of a fully-deprotected hydroxypiperidine employing Ph3P, CCl4, Et3N (e.g. 9 to 10). The procedure comprises five steps from 5 or ent-5 and provides the title quinolizidine 10 or its enantiomer ent-10 in 36-37% overall yields. © 1993.
| Appare nelle tipologie: | 1.1 Articolo su rivista |
File in questo prodotto:
http://hdl.handle.net/11381/2884887
Copyright © 2021