methyl (5R,7S,8R)-8-{[4-(2H-chromen-4-yl)benzoyl]amino}-1-oxaspiro[4.4]nonane-7-carboxylate   、                                                                                                                                                                                                                                                    在
                                                                                                                                                                                 
氮   、                                                                                                  
钯   、                                                                                                  
氢气                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                以to give methyl (5R,7S,8R)-8-{[4-(3,4-dihydro-2H-chromen-4-yl)benzoyl]amino}-1-oxaspiro[4.4]nonane-7-carboxylate (0.10 g, 80%) as a clear oil的产率得到methyl (5R,7S,8R)-8-{[4-(3,4-dihydro-2H-chromen-4-yl)benzoyl]amino}-1-oxaspiro[4.4]nonane-7-carboxylate