An Enantioselective Ring Expansion Route Leading to Furanose and Pyranose Nucleosides Featuring Spirodiketopiperazines at the Anomeric Position
作者:Leo A. Paquette、Stephen Brand、Carsten Behrens
DOI:10.1021/jo982259u
日期:1999.3.1
engage these products in Beckmann rearrangement proved singularly unsuccessful, recourse was alternatively made to new methodology based upon sequential Baeyer-Villiger oxidation and ammonolysis. The data show that the first of these steps occurs with exclusive migration of the quaternary carbon. Furthermore, nucleophilic attack by NH(3) can be directed regioselectively to the anomeric region. If heating