developed to afford pyrido[2,3–d]pyrimidine-2,4-diones derivatives and 2,8-dioxabicyclo[3.3.1]nonane derivatives in moderate to good yields. This method not only establishes a new transformation of 1,3-dimethyl-6-amino-uracil and 2-hydroxychalcone but also provides an efficient method for the synthesis of pyrido[2,3–d]pyrimidine-2,4-diones and 2,8-dioxabicyclo[3.3.1]nonane derivatives.