Abstract
Reaction condition are presented that allow regioselective introduction (N 9 versus N 7) of guanine into sugar analogs under Vorbrüggen conditions. Using conditions, a set of N 2-protected guanosine has been prepared with N 2-isobutyryl-O 6-[2-( p-nitrophenyl)ethyl]guanine ( 1) as nucleophile. This approach helps solve an important synthetic problem in the of guanosine analogs.
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