Photocycloaddition and Rearrangement Reactions in a Putative Route to the Skeleton of Plicamine-Type Alkaloids
作者:Thorsten Bach、Karl-Heinz Rimböck、Alexander Pöthig
DOI:10.1055/s-0034-1380756
日期:——
rearrangements, and Baeyer–Villiger oxidation reactions were studied. In all cases, products were found, which resulted from cleavage of the amino-substituted cyclobutane bond, but not from the desired cleavage of the alternative alkyl-substituted cyclobutane bond. Two isoquinolones were prepared, to which an allenyl side chain was linked at position C4 via a stereogenic silyloxy-substituted carbon atom. Intramolecular
摘要 制备了两个异喹诺酮,其中烯丙基侧链经由立体异构的甲硅烷氧基取代的碳原子连接至C4位。这些底物的分子内[2 + 2]光环加成反应以高非对映选择性进行,并递送具有环外亚甲基的各自的环丁烷(83%和49%的产率)。与5,6-二氧杂异喹诺酮前体形成前所未有的间位观察到-光环加成是显着的副反应,其发生在异喹诺酮骨架的位置C4和C8a处。N-烷基化并转化为相应的环丁酮(22-57%)后,环丁烷产物会进行各种重排反应。详细地,研究了直接光化学重排,热化学和光化学贝克曼重排以及Baeyer-Villiger氧化反应。在所有情况下,都发现了产物,这是由于氨基取代的环丁烷键的断裂而引起的,而不是由于所需的烷基取代的环丁烷键的断裂而引起的。 制备了两个异喹诺酮,其中烯丙基侧链经由立体异构的甲硅烷氧基取代的碳原子连接至C4位。这些底物的分子内[2 + 2]光环加成反应以高非对映选择性进行,并递送具有环外亚甲