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We developed several improved approaches toward 2'-O-methyl adenosine and guanosine and their N-acyl derivatives. (a) Transglycosylation of N 4 -acetyl-5', 3'-di-O-acetyl-2'-O-methyl cytidine with N 6 -Bz-adenine provided N 6 -benzoyl-5'3'-di-O-acetyl-2'-O-methyl adenosine in 50% yield. (b) Regioselective methylation of 2-amino-6-chloro purine riboside with MeI/NaH followed...
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