2-(2-cyano-4-methylphenoxy)-2-methylpropanal 、 (Z)-(7S,8R)-8-Hydroxy-7-hydroxymethyl-8-pyridin-3-yl-oct-4-enoic acid methyl ester 在
对甲苯磺酸 、
原甲酸三甲酯 作用下,
以
乙腈 为溶剂,
生成 (Z)-6-{(2R,4R,5S)-2-[1-(2-Cyano-4-methyl-phenoxy)-1-methyl-ethyl]-4-pyridin-3-yl-[1,3]dioxan-5-yl}-hex-4-enoic acid methyl ester