Enantiomeric Synthesis of d- and l-Cyclopentenyl Nucleosides and Their Antiviral Activity Against HIV and West Nile Virus
摘要:
Enantiomeric synthesis Of D- and L-cyclopentenyl nucleosides and their antiviral activity against HIV and West Nile virus are described. The key intermediate (-)- and (+)-cyclopentenyl alcohols (7 and 15) were prepared from D-gamma -ribonolactone and D-ribose, respectively. Coupling of 7 with appropriately blocked purine and pyrimidine bases via the Mitsunobu reaction followed by deprotection afforded the target L-(+)-cyclopentenyl nucleosides (24-28, 31, 33, and 36). D-(-)Cyclopentenyl nucleosides (1, 40, 43, and 52-56) were also prepared by a similar procedure for L-isomers from 15. The synthesized compounds were evaluated for their antiviral activity against two RNA viruses: HIV and West Nile virus. Among the synthesized D-(-)-nucleosides, adenine (1, neplanocin A), cytosine (55, CPE-C), and 5-fluorocytosine (56) analogues exhibited moderate to potent anti-HIV activity (EC50 0.1, 0.06, and 5.34 muM, respectively) with significant cytotoxicity in PBM, Vero, and CEM cells. Also, cytosine (55) and 5-fluorocytosine (56) analogues exhibited the most potent anti-West Nile virus activity (EC50 0.2-3.0 and 15-20 muM, respectively). Among L-(+)-nucleosides, only the cytosine (27) analogue exhibited weak anti-HIV activity (EC50 58.9 muM).
Total synthesis of carbocyclic nucleoside (+)-neplanocin A
作者:Young Hoon Jung、Seung In Kim、Yeon Ju Hong、Sook Jin Park、Kyung Tae Kang、So Yeon Kim、In Su Kim
DOI:10.1016/j.tet.2014.12.093
日期:2015.2
Asymmetric total synthesis of (+)-neplanocin A was concisely achieved from readily available d-galactose via the regioselective and diastereoselectiveamination of carbocyclic polybenzyl ether usingchlorosulfonylisocyanate and intramolecular olefin metathesis using second-generation Grubbs catalyst.