Synthesis and structure of the marine ascidian 8-oxoadenine aplidiamine

Abstract

Alkylation of 8-oxoadenosine (13) with 4-benzyloxy-3,5-dibromobenzyl bromide (20), followed by Dimroth rearrangement and acid hydrolysis, provided N-(3,5-dibromo-4-hydroxybenzyl)-8-oxoadenosine (15). The 2'- deoxy version of this reaction sequence accomplished the first synthesis of N-(3,5-dibromo-4- hydroxybenzyl)-8-oxoadenine (16), which is the correct expression for marine ascidian purine aplidiamine.