Cyclopropyl Building Blocks for Organic Synthesis, 131. Palladium-Catalyzed Bicyclization with Carbonyl Insertion of Alkenyl-Tethered Propargyl Carbonates Towards a Scalable Synthesis of Various 2-(Bicyclo[3.1.0]hex-1-yl)acrylates
作者:Viktor Bagutski、Norbert Moszner、Frank Zeuner、Urs Karl Fischer、Armin de Meijere
DOI:10.1002/adsc.200606155
日期:2006.10
cyclization of 1,6-enynes with a propargyl carbonate terminus offers the shortest synthetic route to variously substituted 2-(bicyclo[3.1.0]hex-1-yl)acrylates, a novel class of prospective monomers for low-shrinkage polymers. To apply this reaction to large-scale preparations of the said bicyclic acrylates, a flexible Pd catalyst system with tunable reactivity has been developed. The dependence of the
Pd催化的5- exo -trig - 3 - exo -trig1,6-烯炔与碳酸炔丙基酯的级联环化提供了最短的合成路线,可合成各种取代的2-(双环[3.1.0]己-1-基)丙烯酸酯,这是一类用于低收缩率聚合物的新型预期单体。为了将该反应用于所述双环丙烯酸酯的大规模制备中,已经开发了具有可调反应性的柔性Pd催化剂体系。已经研究了产物和非对映异构体分布对两种反应条件(包括所用钯催化剂的类型)和底物性质的依赖性。以克数为单位制备了各种2-(双环[3.1.0]己-1-基)丙烯酸甲酯和母体羧酸,以及一些对技术应用具有潜在兴趣的衍生物。