Nucleosides. 3. Reactions of AICA-riboside with isothiocyanates. A convenient synthesis of isoguanosine and xanthosine derivatives
摘要:
Cyclodesulfurative annulations of 5-[1-(3-substituted-thioureido)]-1-(beta-D-ribofuranosyl)imidazole-4-carboxamides (3a-h) with N,N'-dicyclohexylacarbodiimide are described. Isoguanosine (4) and several 1-substituted isoguanosines 6a-f,h are readily prepared by a ring closure of the appropriate resulting 5-(3-substituted-1-ureido)-1-(beta-D-ribofuranosyl)imididazole-4-carbonitriles 5a-h. Treatment of the appropriate 1-substituted isoguanosines under basic conditions has furnished the corresponding 1-substituted xanthosine 12.
CHERN, JI-WANG;LIN, GWO-SEN;CHEN, CHIEN-SHU;TOWNSEND, LEROY B., J. ORG. CHEM., 56,(1991) N3, C. 4213-4218
作者:CHERN, JI-WANG、LIN, GWO-SEN、CHEN, CHIEN-SHU、TOWNSEND, LEROY B.
DOI:——
日期:——
Nucleosides. 3. Reactions of AICA-riboside with isothiocyanates. A convenient synthesis of isoguanosine and xanthosine derivatives
作者:Ji Wang Chern、Gwo Sen Lin、Chien Shu Chen、Leroy B. Townsend
DOI:10.1021/jo00013a026
日期:1991.6
Cyclodesulfurative annulations of 5-[1-(3-substituted-thioureido)]-1-(beta-D-ribofuranosyl)imidazole-4-carboxamides (3a-h) with N,N'-dicyclohexylacarbodiimide are described. Isoguanosine (4) and several 1-substituted isoguanosines 6a-f,h are readily prepared by a ring closure of the appropriate resulting 5-(3-substituted-1-ureido)-1-(beta-D-ribofuranosyl)imididazole-4-carbonitriles 5a-h. Treatment of the appropriate 1-substituted isoguanosines under basic conditions has furnished the corresponding 1-substituted xanthosine 12.