In one aspect, the present invention is directed to a one pot method of preparing intermediates of Formula V, which are useful in making inhibitors of phosphodiesterase-4: The present invention is also directed to a method of preparing phosphodiesterase inhibitors comprising the Formula . A starting material is evaporated in an evaporator. Second, the bamboo carbon powder in a percentage of 2. The servo signal is combined with a reference signal to produce a position error signal. Therefore, the present invention can decode the image correctly with a limited memory resource, without affecting the display quality of the image. A master digital signal processor triangulates the edge information in the pointer characteristic data to determine a bounding area that represents a pointer perimeter.