Formal Synthesis of (±)-Dendrobine: Use of the Amidofuran Cycloaddition/Rearrangement Sequence
作者:Albert Padwa、Martin Dimitroff、Bing Liu
DOI:10.1021/ol006444h
日期:2000.10.1
The formal synthesis of the alkaloid (+/-)-dendrobine (4) was accomplished using the IMDAF cycloaddition/rearrangement sequence of a furanyl carbamate. Conversion of the rearranged cycloadduct to Kende's advanced intermediate in eight steps completed the formal synthesis of (+/-)-dendrobine.
Application of Furanyl Carbamate Cycloadditions Toward the Synthesis of Hexahydroindolinone Alkaloids
作者:Albert Padwa、Michael A. Brodney、Martin Dimitroff、Bing Liu、Tianhua Wu
DOI:10.1021/jo010020z
日期:2001.5.1
been achieved by an intramolecular Diels--Alder cycloaddition reaction (IMDAF) of furanyl carbamates bearing tethered alkenyl groups. The initially formed [4 + 2]-cycloadduct undergoes nitrogen-assisted ring opening followed by deprotonation of the resulting zwitterion to give the rearranged ketone. The stereochemical outcome of the IMDAF cycloaddition has the sidearm of the tethered alkenyl group oriented