To find the coordinates of point \( B' \) after rotating point \( B(-2, 3) \) by \( 270^\circ \) clockwise around the origin, we can use the rotation formula.
Rotating a point \( (x, y) \) by \( 270^\circ \) clockwise can be done with this transformation: \[ (x, y) \rightarrow (y, -x) \]
Applying this to point \( B(-2, 3) \): \[ B' = (3, -(-2)) = (3, 2) \]
Therefore, the coordinates of point \( B' \) are: \[ \boxed{(3, 2)} \]