A New Method for the Formation of Octahydroindole Alkaloids via the Intramolecular Diels−Alder Reaction of 2-Amidofurans
作者:Albert Padwa、Michael A. Brodney、Martin Dimitroff
DOI:10.1021/jo980815e
日期:1998.8.1
Formal Total Synthesis of (±)-γ-Lycorane and (±)-1-Deoxylycorine Using the [4+2]-Cycloaddition/Rearrangement Cascade of Furanyl Carbamates
作者:Albert Padwa、Michael A. Brodney、Stephen M. Lynch
DOI:10.1021/jo0014109
日期:2001.3.1
gamma-lycorane and (+/-)-1-deoxylycorine were accomplished using an intramolecular Diels-Alder cycloaddition of a furanyl carbamate as the key step. The initially formed [4+2]-cycloadduct undergoes nitrogen-assisted ring opening followed by deprotonation/reprotonation of the resulting zwitterion to give a rearranged hexahydroindolinone. The stereochemical outcome of the IMDAF cycloaddition has the side arm