Asymmetric Construction of Quaternary Stereocenters: Synthesis of Enantiopure Amino Acid-Based Tricyclic α,β-Enones through an ipso-Friedel-Crafts/Michael Addition Cascade
作者:Humberto Rodríguez-Solla、Carmen Concellón、Paula Tuya、Santiago García-Granda、M. Rosario Díaz
DOI:10.1002/adsc.201100497
日期:2012.2
An efficient reaction of the (2R,1′S)- or (2S,1′S)-N,N-bis(p-methoxybenzyl)-2-(1-aminoalkyl)epoxides, derived from α-amino acids, with boron trifluoride-phosphoric acid complex is described. This process affords highly elaborated enantiopure tricyclic α,β-enones in high yields, through an ipso-Friedel–Crafts/Michael addition cascade.
(2 R,1 'S)-或(2 S,1 'S)-N,N-双(对甲氧基苄基)-2-(1-氨基烷基)环氧化物的有效反应,描述了与三氟化硼-磷酸络合物。此过程得到高度精细的对映体纯的三环α,β-烯酮在高收率,通过本位-Friedel -克拉夫茨/迈克尔加成级联。