5-甲基靛红   、                                                                                      
穿心莲内酯   、                                                                                      
L-脯氨酸                                                                                                                                                                                              以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 0.25h,
                                                                                                                以82%的产率得到(3R,3'R,4S)-4-hydroxy-2'-(((1R,4aS,5R,6R,8aS)-6-hydroxy-5-(hydroxymethyl)-5,8a-dimethyl-2-methylenedecahydronaphthalen-1-yl)methyl)-5''-methyl-4,5,5',6',7',7a'-hexahydro-2H,2'H-dispiro[furan-3,1'-pyrrolizine-3',3''-indoline]-2,2''-dione