Enantioselective synthesis of (+)-α-allokainic acid by asymmetric lewis acid-mediated intramolecular ene reaction
作者:W. Oppolzer、C. Robbiani、K. Bättig
DOI:10.1016/s0040-4020(01)82424-8
日期:1984.1
8d→14d (Scheme 4) is a 1̃00%, diastereo- and 90% enantioselective intramolecular enereaction proceeding at 35° on treatment of 8d with Me2A1C1. Saponification of 14d regenerated the auxiliary chiral alcohol and yielded (+)-1 on subsequent decarboxylation. In the analogous cyclization 11d→15d the sense of asymmetricinduction (78% d.e.) was opposite as confirmed by the conversion of 15d to (-)-α-allokainic
An efficient synthesis of 4-aryl kainic acid analogs
作者:Hiroshi Maeda、Natesan Selvakumar、George A. Kraus
DOI:10.1016/s0040-4020(98)01101-6
日期:1999.1
A synthesis of 4-aryl kainic acid analogs was achieved using a highly stereoselective Michael addition reaction of dimethyl 2-oxoglutarate with a nitrostyrene. Nitro group reduction, deoxygenation and epimerization complete the synthetic route.
cyclopropane allows for the formation of a 2,5‐dihydrooxepine which, in turn, is easily converted to a dihydropyrrole. A series of straightforward transformations provides an expedient synthesis of (+/–)‐β‐allokainic acid.