ethyl (4aR,5S,8aR)-2-hydroxy-7-(4-methoxyphenyl)-8-(4-methylphenyl)sulfonyl-2,3,4,4a,5,8a-hexahydropyrano[2,3-b]pyridine-5-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
2-碘酰苯甲酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二甲基亚砜                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
ethyl (4aR,5S,8aR)-7-(4-methoxyphenyl)-8-(4-methylphenyl)sulfonyl-2-oxo-4,4a,5,8a-tetrahydro-3H-pyrano[2,3-b]pyridine-5-carboxylate