[(2R,3R,6S)-6-(tert-butyl-dimethyl-silanyloxymethyl)-2-((2RS)-2,3-dihydroxy-propyl)-3,6-dihydro-2H-pyran-3-yl]-carbamic acid tert-butyl ester 、
2,2-二甲氧基丙烷 在
对甲苯磺酸 、
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
反应 3.0h,
生成 [(2R,3R,6S)-2-((4R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-6-hydroxymethyl-tetrahydro-pyran-3-yl]-carbamic acid tert-butyl ester 、 [(2R,3R,6S)-2-((4S)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-6-hydroxymethyl-tetrahydro-pyran-3-yl]-carbamic acid tert-butyl ester