Misunderstanding about nucleotide biosynthesis
A condensation reaction is defined on Wikipedia as 


  a reaction in which two molecules or moieties, often functional
  groups, combine to form a larger molecule, together with the loss of a
  small molecule. Possible small molecules that are lost include water,
  acetic acid, hydrogen chloride, or methanol, but most commonly in
  biological reactions it is water.


It doesn't say anything about the number of steps required to reach the final compound, nor about the type of bonds formed. Following this definition, the nucleotide synthesis occurs via condensation reactions.