Like the others said, you definitely need a through wall penetration assembly that is acceptable for this purpose, for the specific wall type or other condition you are penetrating with a chimney pipe.
Simply put, the wall type, whatever it may be ie; typical wood framing, sheathing + any other components making up the wall type, typically interior sheathing of drywall, fiber glass insulation, exterior sheathing ie; plywood, osb + siding, are all combustible, so the through wall assembly must completely isolate the heat from the combustible wall assembly.
Aside from that, sounds like you are blanking off the fireplace, which may be non combustible material and using a stove in front of it, I would most certainly NOT use any kind of gypsum drywall period, same theory will apply as mentioned above, you need to completely isolate the nearest combustible material, from the heat of the stove pipe.
Gypsum drwyall, is a material that can provide a fire rating for a wall, say like a common wall between 2 occupied spaces, or a ceiling below an occupied space, but is absolutely not fireproof by any means, even the thick shaft gypsum drywall boards, used to line mechanical chase's and or shafts, trash chutes etc. in high rise buildings will only provide a specified hourly rating. The purpose of that design in conjunction with other rated components of a building is to achieve a uniform fire rating for an occupied space, so that in the event of a fire, you have that amount of time before the rating is exceeded, to get out and or get to a safe area. Structural steel is fireproofed with spray applied fire proofing, but that does not mean it is fire proof, it is done to provide a specified rating, once enough heat is applied and or the fireproofing material is compromised by excessive heat beyond its design, the steel will heat up and ultimately fail from deflection because its strength is weakened, so it no longer can carry its load.
One excellent reference standard for all kinds of rated assemblies is the UL Fire Resistance Directory, each one listed in their 2 volume book, has been tested.
Way more than your asking for, but maybe of some help. Probably a good idea and get something designed for the purpose, and know it's done right, and your home is safe.
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