3-Phenyl-6-(3,4-dimethylphenylamino)uracil   、                                                                                      
2-Hydroxymethylen-cholest-4-en-3-on                                                                                                                                                              在
                                                                                                                                                                                 
对甲苯磺酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二苯醚                                                                                  为溶剂,
                                                                                                                                                    反应 0.75h,
                                                                                                                以44%的产率得到(1R,3aS,3bS,13aR,13bS,15aR)-7-(3,4-dimethylphenyl)-13a,15a-dimethyl-1-((R)-6-methylheptan-2-yl)-10-phenyl-1,2,3,3a,3b,4,5,7,13,13a,13b,14,15,15a-tetradecahydro-9H-cyclopenta[5,6]naphtho[1,2-g]pyrimido[4,5-b]quinoline-9,11(10H)-dione