Total synthesis of balanol, part 2. Completion of the synthesis and investigation of the structure and reactivity of two key heterocyclic intermediates
作者:David Tanner、Lars Tedenborg、Antonio Almario、Ingrid Pettersson、Ingeborg Csöregh、Nicholas M. Kelly、Pher G. Andersson、Thomas Högberg
DOI:10.1016/s0040-4020(97)00167-1
日期:1997.3
enantioselective totalsynthesis of the natural product (-)-balanol (1) is described. In addition to benzophenone fragment 8, key intermediates are chiral bicyclic aziridine 3 and the corresponding epoxide 4, both of which undergo highly regio- and stereoselective nucleophilic ring-opening reactions, allowing control of the two stereogenic centres of the target molecule. The structure and reactivity
Total synthesis of balanol, part 1. Enantioselective synthesis of the hexahydroazepine ring via chiral epoxides and aziridines
作者:David Tanner、Antonio Almario、Thomas Högberg
DOI:10.1016/0040-4020(95)00264-9
日期:1995.5
Three different routes to the hexahydroazepine unit of the natural products balanol (1) and ophiocordin (2) are described. The common starting material is the chiral epoxy alcohol 3 which is converted to the balanol degradation product 10 (Scheme 1) or to suitably protected derivatives thereof: 15 (Scheme 2) and 19 (Scheme 3). A key step in the first route is the acid-catalysed ring-opening of bicyclic