Synthesis of 3,4-dimethylpyrrole

I have recently tried to make 3,4-dimethylpyrrole using ethylcarbamate and 
butadiene from a procedure from Bulletin of the chemical society og Japan 
from around 1965. I have also tried to find the ethylcarboxylate ester of 
3,4-dimethylpyrrole because of its higher stability but there only exists 
small amounts from Sigma in US

Is there anyone which might know of some who made this, prefereable the 
ester for some purpose, which I can purchase. I need approx. 1 gram of the 
compound.

Regards
        Gregers Hansen
        Roskilde University, Denmark
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