This concept creates a paradox, where you should drive the pmos from the same voltage as the output stage. But that volt level is not available at startup. It may or may not be satisfactory to drive the pmos from the output stage. Its voltage starts at the same voltage as the power source, then rises as the converter operates.
So this means a boost converter is tricky to switch. The recommendations in post #3 may be your best bet. That is, if you really want to have synchronous instead of asynchronous.