1,2,3,5,6,7,8,9-octahydro-2-thioxo-4H-cyclohepta[4,5]thieno[2,3-d]pyrimidin-4-one   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                              在
                                                                                                                                                                                 
sodium ethanolate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以75%的产率得到ethyl 1-(p-nitrophenyl)-5-oxo-5,6,7,8,9,10-hexahydro-1H-cyclohepta[4,5]thieno[2,3-d][1,2,4]triazolo[4,3-a]pyrimidin-3-carboxylate