8,8-Dimethyl-4-methylidene-1-(4-methylphenyl)sulfonyl-2-phenyl-6,10-dioxa-1-azaspiro[4.5]decane                                                                                                                                                              在
                                                                                                                                                                                 Amberlyst 15*2,6-di-tert-butylpyridine   、                                                                                                  
水                                                                                                                                  作用下,
                                                                                                                                                                                        反应 0.5h,
                                                                                                                以92%的产率得到(3-hydroxy-2,2-dimethylpropyl) 2-methylidene-4-[(4-methylphenyl)sulfonylamino]-4-phenylbutanoate