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.
Practical synthesis of 6-aryluridines via palladium(II) acetate catalyzed Suzuki–Miyaura cross-coupling reaction
作者:Yu-Chiao Shih、Tun-Cheng Chien
DOI:10.1016/j.tet.2011.03.051
日期:2011.5
Sugar-protected 6-halouridine derivatives underwent Suzuki–Miyaura cross-coupling reactions with arylboronic acids in the presence of palladium(II) acetate as a catalyst, triphenylphosphine as a ligand, and sodium carbonate as a base. This methodology is applicable to both the C5- and C6-position of uridine and provides a direct access for versatile uridine derivatives.