(R)-3-((triethylsilyl)oxy)butanal 、
(2R,4aR,5S,8S)-2-methyl-4-oxo-5-vinylhexahydro-2H-pyrano[3,2-c]pyridine-6(7H)-carboxylic acid benzyl ester 在
lithium hexamethyldisilazane 、 zinc(II) chloride 作用下,
以
四氢呋喃 为溶剂,
反应 4.17h,
以75%的产率得到benzyl (2R,4aR,5S,8aS)-5-ethenyl-3-[(3R)-1-hydroxy-3-triethylsilyloxybutyl]-2-methyl-4-oxo-3,4a,5,7,8,8a-hexahydro-2H-pyrano[3,2-c]pyridine-6-carboxylate