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Diastereoselective and Efficient Synthesis of Indeno[2’’,1’’: 4’,5’]furo[3’,2’:5,6]pyrido[2,3-d]pyrimidine-2,4,6(1H,3H)-trione and 6-(2,3-Dihydro-2-hydroxy-1,3-dioxo-1H-inden-2-yl)-5,8- dihydropyrido[2,3-d]pyrimidine-2,4,7(1H,3H,6H)-trione Derivatives