Have a look at the attached paper. Hope this helps.

You may find many articles on fused pyrrolopyrimidines.

sending link for one.

http://www.sciencedirect.com/science/article/pii/S0968089611009734

You can find your answer in detail in the following newly published article:

(Pyrrolo[2,3-d]pyrimidine synthesis through activation of N-benzyl groups by distal amides).

Laurent El Kaïm, Laurence Grimaud and Simon Wagschal

Org. Biomol. Chem., 2013,11, 6883-6885.