Calcium Plumbite - Colorless crystals that are slightly soluble in water.
It's one of the products of the following reaction:
Pb + ½O2 + Ca(OH)2 → CaPbO2 + H2O
The only reaction I could find that comes close to the one you describe is:
PbO2 + 4 HCl → PbCl2 + Cl2 + 2 H2O