There is a great book that my pediatrician recommended called " Potty Training in Less Than A Day". I was skeptical, but thought, "Well, if it doesn't work, all I've lost is a day and then I go back to more traditional methods". I'm here to say it WORKED. Granted, I have girls, but they were both about two when I used the book. My older daughter showed NO interest in potty training when we started, but I was expecting baby #2, and in my mind mind, potty training was going to be next to impossible once I had two children occupying every waking moment, so I just jumped into to. She was potty trained in about two hours!! My second daughter took less than four hours! Not to say they never had an accident after that, but the accidents were far and few between. They weren't dry through the night until they were over three, but that was not ever an issue for us. When their pullups were consistently dry in the morning, I just switched them to panties.
I can't recommend the book highly enough! It's very time intensive for that one day, but it works!