作者:Liangfeng Fu、Gordon W. Gribble                                    
                                    
                                        DOI:10.1016/j.tetlet.2009.11.085
                                    
                                    
                                        日期:2010.1
                                    
                                    An efficient synthesis of lycogarubin C (3) was completed in seven steps from the known 1-(phenylsulfonyl)indole-3-carbaldehyde in 30% overall yield, via a Diels-Alder reaction between (Z)-1,2-di(1H-indol-3-yl)ethene 9b and dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate (7), followed by a Kornfeld-Boger ring contraction to form the pyrrole ring. (C) 2009 Elsevier Ltd. All rights reserved.