(R)-2-amino-7-(2-bromo-4-fluoro-phenyl)-4-methyl-7,8-dihydro-6H-pyrido[4,3-d]pyrimidine-5-thione   、                                                                                      
(R)-O-((1,4-dioxan-2-yl)methyl)hydroxylamine                                                                                                                                                              在
                                                                                                                                         
Acetic acid, mercury(2+) salt (2:1)                                                                                                                                                                                                                               crude mixture   、                                                                                                  
甲醇   、                                                                                                  
乙腈   、                                                                                                  
水                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以to afford (R,Z)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidin-5(6H)-one O—((R)-1,4-dioxan-2-yl)methyl oxime (39A, 0.0405 g, 36.7% yield)的产率得到(R,Z)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidin-5(6H)-one O-((R)-l,4-dioxan-2-yl)methyloxime