Pyranopyrandiones were prepared by a novel ruthenium-catalyzed carbonylative dimerization of cyclopropenones via C-C bond cleavage. For example, treatment of dipropylcyclopropenone with a catalytic amount of Ru3(CO)12 and NEt3 in THF under 15 atm of carbon monoxide at 140 degrees C for 20 h gave a novel functional monomer, 3,4,7,8-tetrapropylpyrano[6,5-e]pyran-2,6-dione, in an isolated yield of 81%
吡喃并
吡喃二
酮是通过新型
钌催化的
环丙烯酮羰基化二聚反应通过 CC 键裂解制备的。例如,用催化量的 Ru3(CO)12 和 NEt3 在
四氢呋喃中在 15 个大气压的
一氧化碳和 140 摄氏度下处理二丙基环
丙烯 20 小时,得到一种新型功能单体,3,4,7,8-四丙基
吡喃 [6] ,5-e]pyran-2,6-dione,分离产率为 81%。在类似的反应条件下,通过
环丙烯酮与
炔烃的羰基化偶联,也可以得到不对称取代的
吡喃并
吡喃二
酮。