Synthesis of Eight- and Nine-Membered Carbocycles through a Ring-Closing Metathesis/Ring Fragmentation Strategy: A Rapid and Versatile Approach to Bicyclo[6.4.0]- and Bicyclo[7.4.0]alkene Ring Systems
作者:J. Ramón Rodríguez、Luis Castedo、José L. Mascareñas
DOI:10.1002/1521-3765(20020703)8:13<2923::aid-chem2923>3.0.co;2-7
日期:2002.7.3
Ring-closing metathesis (RCM) of cis-2,6-dialkenyl-2-hydroxy-1-cyclohexanones affords bicyclo[3.n.1]alkenones that are easily converted into eight- or nine-membered carbocycles by oxidative cleavage of the keto-bridging tether. Since the starting cyclohexanones are readily assembled from commercially available 1,2-cyclohexanedione, the overall process constitutes a rapid and versatile route to medium-sized
顺式-2,6-二烯基-2-羟基-1-环己酮的闭环复分解(RCM)提供双环[3.n.1]烯酮,该环烯通过氧化裂解可容易地转化为八元或九元碳环。酮桥系绳。由于起始的环己酮很容易从市售的1,2-环己二酮组装而成,因此整个过程构成了向中型碳环化合物快速且通用的途径,否则这些化合物很难使用当前可得的方法进行组装。如果环己酮链中的一个烯烃被炔烃取代,则随后的RCM会生成1,3-二烯系统,该系统能够与活化的亲二烯体进行立体选择性Diels-Alder反应。所得三轮车的酮桥的氧化裂解导致具有最多四个立体中心的8-6和9-6稠合双碳轮。