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.
Ethyl 2-methylcyclopent-2-ene-1-carboxylate (3) is an important building block in the synthesis of some natural products. In this paper, 2GGC was used for the RCM reaction to prepare this scaffold instead of reported 1GGC. This scaffold (3) was obtained in a moderate yield and its structure was determined by 1H NMR and 13C NMR. A contra-ring closing metathesis mechanism was also put forward to explain
A highly stereoselective synthesis of Z-trisubstituted olefins via [2,3]-sigmatropic rearrangement. Preference for a pseudoaxially substituted transition state
作者:W. Clark Still、Abhijit Mitra
DOI:10.1021/ja00474a049
日期:1978.3
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