Yes. You can fly with QF SYD-AKL-PPT or SYD-LAX-PPT and then pick up LA from PPT-IPC. Alternatively you could go SYD-AKL-SCL using LA (also a QF codeshare) and then pick up SCL-IPC from there.
Take a look at the One World timetable (http://www.oneworld.com) to work out dates/times.