7-DEAZAADENINE 2',5'-AND 3',5'-DINUCLEOSIDE PHOSPHATES AND PROCESS FOR THEIR PREPARATION

摘要

1,165,745. Dinucleoside phosphates. UPJOHN CO. 31 Aug., 1966 [20 Sept., 1965], No. 38868/66. Heading C2A and C2C. Novel dinucleoside phosphates of the Formulµ IVa and IVb in which X is H, αOH or #OH, Z is H, OH, amino, acylamino in which the acyl group is of a hydrocarbon carboxylic acid containing from 2 to 12 carbon atoms inclusive or is anisoyl, or Z is mercapto or C 1 -C 4 alkyl mercapto, Y is cytosin - 1 - yl, uracil - 1 - yl, thymin - 1 - yl, adenin - 9 - yl, guania - 9 - yl, 6 - mercaptopurin - 9 - yl, uracil - 3 - yl, 5- fluorouracil - 1 - yl, 5 - chloro(bromo - or iodo - )uracil - 1 - yl, 5 - trifluoromethyl - uracil - 1 - yl, hypoxanthin - 9 - yl, xanthin - 9 - yl, 5 - methylcytosin - 1 - yl, 3 - methylcytosin - 1 - yl, 2,6 - diamino - purin - 9 - yl, 5 - hydroxymethylcytosin - 1 - yl, 7 - deaza - adenin - 9 - yl, 6 - mercapto - 7 - deazapurin - 9 - yl, 7 . deazahypoxanthin - 9 - yl or 6 - azauracil - 1 - yl and the corresponding novel compounds in which the group Y is an aoylated group are obtained by treating a 7- deazapurin riboside of the Formula (1) wherein R 1 and R 2 are C 1 -C 4 alkyl radicals or together form a C 4 -C 6 alkylene chain with a phosphorylating agent, especially 2-cyanoethyl phosphate, in the presence of a condensing agent, especially dicyclohexyl carbodiimide, and then with an aqueous alkali base to give the corresponding 51 -phosphate (11), condensing (11) with a compound of the Formula (X) wherein T is triphenylmethyl, (p-methoxyphenyl)diphenylmethyl or bis(#-methoxy phenyl)phenylmethyl and Y1 is a group as defined for Y above but in which the substituents capable of being acylated are acylated (the acyl group being as defined above) to give compounds of the Formulµ IIIa and IIIb and hydrolysing the protective groups with an acid, and when Y1 is different from Y, with a base to give the products IVa and IVb or when the group Y1 in the product is to be an acylated Y group hydrolysing with an acid only to remove the protective groups. When the compound of Formula I is a 7-deazaadenine derivative the initial material used in the examples is 9-#-D- ribofuranosyl - 7 - deazaadenine (sparsomycin A) the preparation of which by a fermentation process using a soil slant of Streptomyces spdrsogenes var sparsogenes is described, the sparsomycin A being then converted to various derivatives of Formula I and intermediates therefor. Several examples are given and the preparation of various etherified nuoleoside derivatives of Formula X and of various intermediates for their preparation is also described. The novel dinucleoside phosphates exhibit cytotoxic activity in vitro against Herpes, Coe and Vaccinia viruses and can be used for preparing phage-free antibiotic-producing streptomyces cultures and the compounds of Formulµ IVa and IVb are also active against bacteria and fungi. 9 - # - D - arabinofuranosyl guanines (preparation 34) is obtained from the chloromercury derivative of 2,6-diacetamidopurine and 2,3,5- tri - O - benzyl - D - arabinofuranosyl chloride by the following sequence of reactions wherein C 7 H 7 O is benzyloxy