N-[6-(2-methyl-imidazol-1-yl)-2,4-dioxo-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl]-methanesulfonamide   、                                                                                      
氯甲酸乙酯                                                                                                                                                              在
                                                                                                                                                                                 crude product   、                                                                                                  silica gel   、                                                                                                  
ethyl acetate n-hexane   、                                                                                                  
乙酸乙酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
吡啶                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以to yield methanesulfonyl-[6-(2-methyl-imidazol-1-yl)-2,4-dioxo-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl]-carbamic acid ethyl ester (34 mg, 0.070 mmol, 47% yield) as white resin的产率得到methanesulfonyl-[6-(2-methyl-imidazol-1-yl)-2,4-dioxo-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl]-carbamic acid ethyl ester