Adenine precursor synthesis

I am currently exploring the synthesis of xRNA, which contains benzo-expanded purine and pyrimidines. I have found [this paper](http://pubmedcentralcanada.ca/pmcc/articles/PMC3039074/) which deals with exactly this subject, and provides the following synthetic pathway for the xA ribonucleotide.


![enter image description here](https://i.stack.imgur.com/Osaid.jpg)


Unfortunately, the first 5 synthetic steps are omitted from the paper, and are likely to be found in one of the following three papers, none of which are publicly available.


[1.](http://www.ncbi.nlm.nih.gov/pubmed/14746479) [2.](http://www.ncbi.nlm.nih.gov/pubmed/15651812) [3.](http://www.ncbi.nlm.nih.gov/pubmed/819479) 


Nonetheless, I am interested in **any synthetic pathway which will lead me from the first to the second molecule shown above**. I understand the presented material, but as an undergraduate cell biologist, I am a little rusty on my synthetic organic chem.


EDIT: The first thing that came to mind was the condensation of a biscarbonyl electrophile and bisamine nucleophile like in [pyrimidine synthesis](http://en.wikipedia.org/wiki/Pyrimidine#Organic_synthesis).




Well, you are right, the synthesis of your second compound is described in DOI:[10.1021/ja038384r](http://dx.doi.org/10.1021/ja038384r):


![enter image description here](https://i.stack.imgur.com/3G4Jq.png)


![enter image description here](https://i.stack.imgur.com/R6301.png)


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