Enantioselective Synthesis of Planar-Chiral Carba-Paracyclophanes: Rhodium-Catalyzed [2+2+2] Cycloaddition of Cyclic Diynes with Terminal Monoynes
作者:Tatsuya Araki、Keiichi Noguchi、Ken Tanaka
DOI:10.1002/anie.201300696
日期:2013.5.17
Just ‘plane’ chiral: The high‐yielding and highly enantioselectivesynthesis of carba[10]–[12]paracyclophanes has been achieved with up to 91 % yield and 93 % ee by using the cationic rhodium(I)/(S,S)‐bdpp‐catalyzed [2+2+2] cycloaddition of cyclicdiynes with terminalmonoynes under high substrate concentrations. nbd=2,5‐norbornadiene, Ns=p‐nitrobenzenesulfonyl, Ts=4‐toluenesulfonyl.