(4R,5S)-2,3-Dihydroxy-4-methoxy-5-triethylsilanyloxy-hexanoic acid methyl ester 在
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
反应 1.5h,
生成 (3R,4R,5R,6S)-3,4-Dihydroxy-5-methoxy-6-methyl-tetrahydro-pyran-2-one 、
(3S,4S,5R,6S)-3,4-Dihydroxy-5-methoxy-6-methyl-tetrahydro-pyran-2-one