Transition-Metal-Catalyzed Rearrangement of 1,1-(Oligomethylene)-4-aryl-2-butene-1,4-diols: Ring Expansion vs. Aryl Group Migration
作者:Stefan Kirsch、Alex Lange、Wolfgang Heydenreuter、Helge Menz
DOI:10.1055/s-0029-1218274
日期:2009.11
transition-metal-catalyzed rearrangement of 1,1-(oligomethylene)-4-aryl-2-butene-1,4-diols was investigated. In the presence of PdCl(2)(MeCN)(2) and Cu(OTf)(2), a rapidly equilibrating 1,3-isomerization is followed by 1,2-migration to produce cyclopentanones or cyclohexanones through expansion Of four- or five-membered ring systems. When employing larger ring systems or acyclic cores, aryl migration provides 2-aryl
研究了过渡金属催化的 1,1-(低聚亚甲基)-4-芳基-2-丁烯-1,4-二醇的重排。在 PdCl(2)(MeCN)(2) 和 Cu(OTf)(2) 存在下,快速平衡的 1,3-异构化之后是 1,2-迁移以通过四或五元环系统。当使用更大的环系统或无环核时,芳基迁移会提供 2-芳基醛。