97205-05-5

Upstream product

• 4672-45-1 2-chlorophenylphosphoryl dichloride 
• 97205-04-4 Phosphoric acid (2R,3R,4R,5R)-2-(6-amino-purin-9-yl)-4-(tert-butyl-dimethyl-silanyloxy)-5-[(4-methoxy-phenyl)-diphenyl-methoxymethyl]-tetrahydro-furan-3-yl ester 2-chloro-phenyl ester 4-nitro-phenyl ester 
• 18162-48-6 tert-butyldimethylsilyl chloride 
• 51600-11-4 5'-O-(p-methoxyphenyldiphenylmethyl)adenosine 
• 69504-15-0 2',3'-O,O-bis(t-butyldimethylsilyl)adenosine 
• 69504-05-8 3'-O-<(tert-butyl)dimethylsilyl>-5'-O-(monomethoxytrityl)adenosine 
• 72677-42-0 o-chlorophenyl p-nitrophenyl phosphorochloridate 

Relevant academic research and scientific papers

Practical Synthesis of 2'-5'-Linked Oligoadenylates (2-5A Oligomers)

A general, facile synthesis of 2'-5'-linked oligonucleotides (2-5A oligomers) has been achieved based on the second-order regioselective protection of adenosine, one-pot formation of the 2'-5' internucleotide linkage, and O-selective phosphorylation of N-unblocked nucleosides.Standard t-butyldimethylsilylation of 5'-O-p-methoxytrityladenosine followed by careful recrystallization from a mixture of triethylamine, methanol, ethyl acetate and ether (4:4:5:100 v/v) gives the 3',5'-di-O-protected adenosine in high yield.Magnesium alkoxide-mediated condensation of the 2'-O-free adenosine with o-chlorophenyl p-nitrophenyl phosphorochloridate followed by 2',3'-di-O-t-butyldimethylsilyladenosine produces the N-free and fully O-protected adenylyl(2'-5')adenosine.The resulting adenylyl dimer, after removal of the 5'-O-trityl protector, is elongated to the protected trimeric compound through a similar reaction sequence.Deprotection of the product furnishes the 2-5A core.Condensation of the 5'-O-detritylated core and bis(2,2,2-trichloroethyl) phosphorochloridate assisted by 2,6-lutidine and subsequent oxidation with aqueous iodine produces, after deblocking, 2-5A 5'-monophosphate (p5'A2'p5'pA2'p5'A).The 2-5A 5'-monophosphate is converted into 2-5A 5'-triphosphate (ppp5'A2'p5'A2'p5'A) by reaction with N,N'-carbonyldiimidazole in the presence of triethylamine followed by tributylammonium diphosphate.This procedure allows ready synthesis of 2-5A oligomers and related compounds on a multigram scale.

A CONVENIENT SYNTHESIS OF 2'-5' LINKED OLIGORIBONUCLEOTIDES

A general synthesis of 2'-5' linked oligoribonucleotides has been achieved on the basis of chemoselective formation of the 2'-5' internucleotide linkage using N-unblocked nucleosides.