If you can avoid it, don't mismatch tire compounds front-to-rear.
From personal experience, what @
soundman98 says is true. Yes you can drive the car, but the TCS system is going to be very active and the general confidence of the car is going to suffer.
I had a puncture in one of my tires and was running mismatched compounds for a while until I had a chance to replace the tire. I used Hankook Ventus V12 Evo2 and Federal 595 RS-RR, both same size (245/40R17) but paired on different axles. The TCS was way touchier than it should be, and triggering a lot when it didn't used to. The car overall felt more "floaty" and vauge on corners as well.