9-Hydroxy-4-hydroxymethyl-2,2-dimethyl-8-<<<(1,1-dimethylethyl)diphenylsilyl>oxy>methyl>-6-oxo-1,3,7-trioxaspiro<4.4>nonan-9-carboxylic acid phenylmethyl ester                                                                                                                                                              在
                                                                                                                                                                                 
四丁基氟化铵   、                                                                                                  
溶剂黄146                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                生成                                                 (4S,5S,8S,9R)-9-Hydroxy-4,8-bis(hydroxymethyl)-2,2-dimethyl-6-oxo-1,3,7-trioxaspiro<4.4>nonan-9-carboxylic acid phenylmethyl ester   、                                                                                             
(4R,5R,8R,9S)-9-Hydroxy-4,8-bis(hydroxymethyl)-2,2-dimethyl-6-oxo-1,3,7-trioxaspiro<4.4>nonan-9-carboxylic acid phenylmethyl ester