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<blockquote>I get a phase shift of 90 degrees between voltage of the capacitor and current through the capacitor which doesn't make sense it should be 45 degrees</blockquote>

You don't need a whole circuit to see that the phase shift should be 90&deg;.  You can see that from a capacitor in isolation.

The current thru a capacitor is proportional to the derivative of the voltage across it.  If the voltage on a cap is a sine, then the current is a cosine, which has 90&deg; leading phase relative to the voltage.  Since this is what a capacitor inherently does, it doesn't matter what the rest of the circuit is trying to do.  The above will always be true (for an ideal capacitor).