Unfortunately, and contrary to what you may have seen on television, you can NOT spot reduce.
There is one stimulant I know of that does bind to fat cell receptors in the "tummy" area, and that is ephidrine or epinepherine, or nor-epinepherine... basically all forms of adrenaline.
So if you want to scare the fat off of your tummy, that might be the key, but the problem with that is the damage you do to the rest of your body by having all that adrenaline floating around your system.
If you're really interested in losing weight as fast as possible while keeping it off, I explain why and how my weight loss program works in my new weight loss and diet program.