Triphenylphosphine → methyl 3-((1S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-methylethoxy)-5-[4-(methylsulfonyl)phenoxy]benzoate

Beteiligte Stoffe

Reaktionsschritte

After then adding 11.8 g (62.1 mmol) of (2R)-1-(t-butyldimethylsiloxy)-2-hydroxypropane and 16.3 g (62.1 mmol) of triphenylphosphine to a solution of 10.0 g (31.0 mmol) of the obtained 5-hydroxy-3-(4-methanesulfonyl-phenoxy)benzoic acid methyl ester in tetrahydrofuran (200 ml), 33.8 ml (77.6 mmol) of a solution of diethyl azodicarboxylate in 40% toluene was added while cooling on ice, and the mixture was stirred at room temperature for 12 hours. The reaction mixture was concentrated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane:acetic acid ethyl ester=8:2) to obtain 5-((1S)-2-(tert-butyldimethylsiloxy)-1-methyl-ethoxy)-3-(4-methanesulfonyl-phenoxy)-benzoic acid methyl ester as a yellow oil.

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