Mix together sugar and cinnamon. Quarter biscuits. Coat in sugar/cinnamon mixture. Drop into a well-greased Bundt pan.
Mix together remaining sugar/cinnamon mixture and 1 1/2 sticks butter. Cook over low heat. Bring to a boil. Pour over biscuits. Bake 45-50 minute at 350 degrees. Remove immediately; cool. Pick pieces apart. DO NOT cut or slice.