N-[(3RS)-1-(azacyclooctan-1-yl)carbonylmethyl-2,3-dihydro-5-hydroxymethyl-9-methyl-2-oxo-1H-1,4-benzodiazepin-3-yl]-N'-(3-methylphenyl)urea                                                                                                                                                              在
                                                                                                                                         manganese dioxide                                                                                                                                                                                                                               
异丙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                以to give N-[(3RS)-1-(azacyclooctan-1-yl)carbonylmethyl-2,3-dihydro-5-formyl-9-methyl-2-oxo-1H-1,4-benzodiazepin-3-yl]-N′-(3-methylphenyl)urea as crystalline powder (1.20 g, 80.2% yield)的产率得到N-[(3RS)-1-(azacyclooctan-1-yl)carbonylmethyl-2,3-dihydro-5-formyl-9-methyl-2-oxo-1H-1,4-benzodiazepin-3-yl]-N'-(3-methylphenyl)urea