(2R)-2-[(4R,5S)-5-[(1R)-1-[tert-butyl(dimethyl)silyl]oxypropyl]-2,2,5-trimethyl-1,3-dioxolan-4-yl]pentan-3-one 、
(2R,3S,4R)-3-(tert-Butyl-dimethyl-silanyloxy)-4-((4R,5S)-5-formyl-2,2,5-trimethyl-[1,3]dioxolan-4-yl)-2-methyl-pentanoic acid methyl ester 在
lithium bis(dimethylphenylsilyl)amide 作用下,
以
四氢呋喃 为溶剂,
以75%的产率得到methyl (2R,3S,4R)-3-[tert-butyl(dimethyl)silyl]oxy-4-[(4R,5R)-5-[(1R,2R,4R)-4-[(4R,5S)-5-[(1R)-1-[tert-butyl(dimethyl)silyl]oxypropyl]-2,2,5-trimethyl-1,3-dioxolan-4-yl]-1-hydroxy-2-methyl-3-oxopentyl]-2,2,5-trimethyl-1,3-dioxolan-4-yl]-2-methylpentanoate