Charge pump configured to invert polarity. Notice your 5V supply must provide several Amperes, if you wish to attach a 2A load.
Although diodes make for easier construction, they subtract from the output voltage. Instead transistors are suitable. Bias signals can be obtained from strategic points in the circuit.
The transistor marked '?' carries 90mA in an upward direction when it's supposed to be off. I tried to shut it off by taking bias voltage from various points. I tried a PNP type. It appears the only way to shut it off is by building a second clock signal.