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I'll check out that paper you referred to sometime, I'm not particularly close to a library at the moment.

I think it's a general case in organic chemistry that a number of slightly different conditions will all succesfully carry out the reaction, just one particular set of reagents usually works best for a particular substrate or one set of reagents is just more convenient to use.

I actually wouldn't recommend wasting your time looking up that paper.  There is practically nothing about the synthesis (except the procedure), it's mostly about the pharmacology of the products.