(2R,3S,4R)-1-{2-[(1S,2S,5S)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methyl-5-((2R,3R,6S)-3-methyl-1,7-dioxa-spiro[5.5]undec-2-yl)-hexyl]-[1,3]dithian-2-yl}-3-methoxy-5-methyl-hexane-2,4-diol                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶   、                                                                                                  poly(hydrogen fluoride)pyridine   、                                                                                                  
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                生成                                                 (R)-3-Hydroxy-3-(4-methyl-2,5-dioxo-2,5-dihydro-furan-3-yl)-propionic acid (1R,2S,3R)-3-hydroxy-4-{2-[(1S,2S,5S)-2-hydroxy-1-methyl-5-((2R,3R,6S)-3-methyl-1,7-dioxa-spiro[5.5]undec-2-yl)-hexyl]-[1,3]dithian-2-yl}-1-isopropyl-2-methoxy-butyl ester