Nucleosides. LIV<sup>1</sup>Synthesis and Properties of 3′-Azido- and 2′,3′-Dideoxy-6,7-diphenyllumazine Nucleosides
作者:Xiaodong Cao、Wolfgang Pfleiderer
DOI:10.1080/15257779408013278
日期:1994.3
The best approach for the synthesis of 1-(3-azido-2,3-dideoxy-beta-D-erythro-pentofuranosyl)lumazine (5) and its 6,7-dimethyl- (4) and 6,7-diphenyl derivatives (3) has been found in the interconversion of the corresponding 1-(2-deoxy-beta-D-threo-pentofuranosyl)-lumazines. Monomethoxytritylation at the 5'-position (1 7, 3 4, 4 9) followed by mesylation at the 3'-OH group and subsequent nucleophilic displacement by lithium azide afforded 1 9, 2 9 and 4 7 which were deprotected by acid treatment to give 3-5 in good yields. The syntheses of 1-(2,3-dideoxy-beta-D- glycero-pentofuranosyl)-6,7-diphenyllumazine (6) and its 6,7-dimethyl derivative (7) were achieved from 1-(2-deoxy-beta-D-erythro-pentofuranosyl)- 6,7-diphenyllumazine and the corresponding 6,7-dimethyllumazine (2 6) via their 5'-O-p-toluoyl- (2 0, 3 0), and 3'-deoxy-3'-iodo derivatives (2 4, 3 1) to form, after radical dehalogenation and final deprotection, 6 and 7. The newly synthesized lumazine nucleosides have been characterized by elemental analyses, UV- and NMR spectra.