Application of Photochemical Decarbonylation of Cyclopropenones for the in Situ Generation of Reactive Enediynes. Construction of a Cyclopropenone-Containing Enediyne Precursor by Using a Cyclopropenone Acetal Building Block
作者:Andrei Poloukhtine、Vladimir V. Popik
DOI:10.1021/jo048065y
日期:2005.2.1
was prepared in 10 steps by sequential modification of the cyclopropenone 2,2-dimethyl-1,3-propanediyl acetal (5). The crucial cyclization step was achieved under Nozaki conditions, while the endocylic double bond has been introduced by the allylic rearrangement. UV irradiation of the cyclopropenone 1 results in efficient decarbonylation and the formation of the reactive enediyne 2. The latter undergoes
制备了含有环丙烯酮的烯二炔光前体6-叔丁基二甲基甲硅烷氧基-3-(α-羟基苄基)双环[8.1.0] undeca-1(10),2-二烯-4-yn-11-one(1)通过依次修饰环丙烯酮2,2-二甲基-1,3-丙二基乙缩醛(5),以10个步骤进行操作。关键的环化步骤是在Nozaki条件下完成的,而内聚双键已通过烯丙基重排引入。环丙烯酮1的紫外线辐射导致有效的脱羰作用和反应性烯二炔2的形成。后者在40°C下进行Bergman环芳构化,半衰期为12 h,在1,4-二氢苯存在下可定量产生相应的四氢化萘29。