(R)-4-((2S,6R)-6-Allyl-tetrahydro-pyran-2-yl)-2-methyl-butyraldehyde 、
2-Methyl-2-[(2R,6S)-6-(2-oxo-propyl)-tetrahydro-pyran-2-yl]-propionic acid benzyl ester 在
N,N-二异丙基乙胺 、
diethylboron trifluoromethanesulfonate 作用下,
以
乙醚 、
正己烷 为溶剂,
生成 2-{(2R,6S)-6-[(4S,5R)-7-((2S,6R)-6-Allyl-tetrahydro-pyran-2-yl)-4-hydroxy-5-methyl-2-oxo-heptyl]-tetrahydro-pyran-2-yl}-2-methyl-propionic acid benzyl ester 、 2-{(2R,6S)-6-[(4R,5R)-7-((2S,6R)-6-Allyl-tetrahydro-pyran-2-yl)-4-hydroxy-5-methyl-2-oxo-heptyl]-tetrahydro-pyran-2-yl}-2-methyl-propionic acid benzyl ester