Synthesis of 6-Alkyluridines from 6-Cyanouridine via Zinc(II) Chloride-Catalyzed Nucleophilic Substitution with Alkyl Grignard Reagents
摘要:
6-Cyanouracil derivatives underwent a direct nucleophilic substitution reaction with alkyl Grignard reagents in the presence of zinc(II) chloride as a catalyst to form the corresponding 6-alkyluracils. This methodology is applicable to sugar-protected 6-cyanouridine and 6-cyano-2'-deoxyuridine without the protection at the N-3-imide and provides a facile and general access to versatile 6-alkyluracil and 6-alkyluridine derivatives.
Synthesis of 5-substituted nucleosides via the regioselective lithiation of 2′-deoxyuridine
作者:Robert W. Armstrong、Saaket Gupta、Fayelle Whelihan
DOI:10.1016/s0040-4039(01)93710-4
日期:1989.1
Treatment of 2′-deoxy-3′,5′-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-uridine with sec-BuLi in the presence of TMEDA resulted in a highly regioselective lithiation at C-5. The lithiated derivative was treated with a number of electrophiles to afford 5-substituted2′-deoxyuridines.