2,6-dimethylphenyl 2,4-dimethyl-6-[4-[(1,1-dimethylethyl)dimethylsilyl]oxy-1,7-dioxaspiro[5.5]undec-2-yl]-3-hydroxy-4E-hexenoate 生成 2,6-dimethylphenyl 2,4-dimethyl-6-[4-[(1,1-dimethylethyl)dimethylsilyl]oxy-1,7-dioxaspiro[5.5]-undec-2-yl]-3-(methoxymethyl)oxy-4E-hexenoate