(11Z)-9-ethoxy-8-isobutyl-11-(2-methylpropylidene)-8,11-dihydro-6H-oxepino[2,3-d]pyrazino[1,2-a]pyrimidin-6-one                                                                                                                                                              在
                                                                                                                                                                                 
水   、                                                                                                  
溶剂黄146                                                                                                                                  作用下,
                                                                                                                                                                                        反应 1.5h,
                                                                                                                生成                                                 (R)-9-ethoxy-8-isobutyl-11-((Z)-2-methylpropylidene)-8,11-dihydro-6H-oxepino[2,3-d]pyrazino[1,2-a]pyrimidin-6-one   、                                                                                             (8S,11Z)-8-isobutyl-11-(2-methylpropylidene)-10,11-dihydro-6H-oxepino[2,3-d]pyrazino[1,2-a]pyrimidine-6,9(8H)-dione