Access to a Welwitindolinone Core Using Sequential Cycloadditions
作者:Barry M. Trost、Patrick J. McDougall
DOI:10.1021/ol901499b
日期:2009.8.20
A concise approach to the core skeleton of the welwitindolinone alkaloids was developed on the basis of sequential cycloaddition reactions. First, a palladium catalyzed enantioselective [6 + 3] trimethylenemethanecycloaddition onto a tropone nucleus was used to generate the requisite bicyclo[4.3.1]decadiene. Subsequent modifications to the cycloadduct allowed for an intramolecular [4 + 2] cycloaddition