3-Hydroxybenzaldehyde → Methyl 2-(tert-butoxycarbonylamino)-3-(3-hydroxyphenyl)acrylate

Beteiligte Stoffe

Reaktionsschritte

Methyl [(tert-butoxycarbonyl)amino](dimethoxyphosphoryl)acetate (Fluka, Cat. #09659) (0.97 g, 3.3 mmol) and 3-hydroxybenzaldehyde (0.400 g, 3.28 mmol) were combined in methylene chloride (14 mL) at r.t. under nitrogen. To this DBU (0.68 mL, 3.9 mmol) was added and the reaction was stirred at r.t. for 2 h. The reaction was taken up in ethyl acetate, washed with 1 N HCl, brine, dried over magnesium sulfate and concentrated under reduced pressure to give the crude product as an oil. The product was purified by Flash chromatography on a silica gel column eluting hexane: ethyl acetate gradient to give methyl 2-(tert-butoxycarbonylamino)-3-(3-hydroxyphenyl)acrylate (0.92 g, 96%) as a clear oil Analytical LCMS (M+H-Boc)+: m/z=193.9.

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