Acetic acid (E)-(S)-1-[(2R,5R)-5-(1-acetoxy-1-methyl-ethyl)-2-methyl-tetrahydro-furan-2-yl]-3-iodo-allyl ester 、 (2R,4aS,6S,8aS)-6-((2S,5R)-5-Bromo-2,6,6-trimethyl-tetrahydro-pyran-2-yl)-8a-methyl-octahydro-pyrano[3,2-b]pyran-2-carbaldehyde 在
chromium dichloride 、 nickel dichloride 作用下,
以
二甲基亚砜 为溶剂,
反应 48.0h,
以37%的产率得到Acetic acid (E)-(S)-1-[(2R,5R)-5-(1-acetoxy-1-methyl-ethyl)-2-methyl-tetrahydro-furan-2-yl]-4-[(2R,4aS,6S,8aS)-6-((2S,5R)-5-bromo-2,6,6-trimethyl-tetrahydro-pyran-2-yl)-8a-methyl-octahydro-pyrano[3,2-b]pyran-2-yl]-4-hydroxy-but-2-enyl ester