dexamethasone 17-propionate 21-acetate                                                                                                                                                              在
                                                                                                                                                                                 selenium(IV) oxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                    反应 2.5h,
                                                                                                                以23%的产率得到Propionic acid (6R,8S,9R,10S,11S,13S,14S,16R,17R)-17-(2-acetoxy-acetyl)-9-fluoro-6,11-dihydroxy-10,13,16-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl ester