23192-64-5Relevant articles and documents
High-throughput five minute microwave accelerated glycosylation approach to the synthesis of nucleoside libraries
Bookser, Brett C.,Raffaele, Nicholas B.
, p. 173 - 179 (2007/10/03)
The Vorbrueggen glycosylation reaction was adapted into a one-step 5 min/130 °C microwave assisted reaction. Triethanolamine in acetontrile containing 2% water was determined to be optimal for the neutralization of trimethylsilyl inflate allowing for direct MPLC purification of the reaction mixture. When coupled with a NH3/methanol deprotection reaction, a high-throughput method of nucleoside library synthesis was enabled. The method was demonstrated by examining the ribosylation of 48 nitrogen containing heteroaromatic bases that included 25 purines, four pyrazolopyrimidines, two 8-azapurines, one 2-azapurine, two imidazopyridines, two benzimidazoles, three imidazoles, three 1,2,4-triazoles, two pyrimidines, two 3-deazapyrimidines, one quinazolinedione, and one alloxazine. Of these, 32 yielded single regioisomer products, and six resulted in separable mixtures. Seven examples provided inseparable regioisomer mixtures of -two to three compounds (16 nucleosides), and three examples failed to yield isolable products. For the 45 single isomers isolated, the average two-step overall yield ± SD was 26 ± 16%, and the average purity ± SD was 95 ± 6%. A total of 58 different nucleosides were prepared of which 15 had not previously been accessed directly from glycosylation/deprotection of a readily available base.
A UNIQUE TRANSFORMATION OF 5-AMINO-N'-METHOXYIMIDAZOLE-4-CARBOXAMIDINES BY DIAZOTIZATION: SYNTHESIS OF THE 5-AZIDO ANALOGUE OF AICA RIBOSIDE
Saito, Tohru,Asahi, Yayoi,Nakajima, Satoshi,Fujii, Tozo
, p. 329 - 332 (2007/10/02)
Diazotization of 1-substituted 5-amino-N'-methoxyimidazole-4-carboxamidines (I) was found to give the 5-azidoimidazole-4-carbonitriles II through the 1-methoxy-2-azaadenine intermediates IV.The product IIb from the riboside Ib was utilized for the synthesis of 5-azido-1-β-D-ribofuranosylimidazole-4-carboxamide (Vb), a novel AICA riboside analogue.
Production of 2,6-diaminonebularines
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, (2008/06/13)
Compounds of the formula STR1 wherein R is phenyl which may be substituted; or their acid addition salts, are produced in good yield by reacting a compound of the formula STR2 wherein R1, R2 and R3, independently of one another, are hydroxyl which may be protected, which is prepared in 2 or 3 steps from 5-amino-1-β-D-ribofuranosylimidazole-4-carboxamide, with a compound of the formula STR3 wherein R has the same meaning as defined above and X is amino which may be substituted or lower alkylthio, and, if necessary subjecting the resulting compound to a treatment for removal of protective groups on its hydroxyls.