Total Synthesis of 7- and 8-Oxygenated Pyrano[3,2-<i>a</i>]carbazole and Pyrano[2,3-<i>a</i>]carbazole Alkaloids via Boronic Acid-Catalyzed Annulation of the Pyran Ring
作者:Konstanze K. Julich-Gruner、Olga Kataeva、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1002/chem.201403143
日期:2014.7.7
The boronic acid‐catalyzed annulation of citral opens up a short route to oxygenated cyclized monoterpenoid pyranocarbazole alkaloids. Thus, murrayamine‐D is available in only three steps and 55% overall yield from the corresponding carbazole precursor.