(Methoxymethylene)triphenylphosphorane → HCID 131734415、化合物

To a stirred solution of (methoxymethylene)triphenylphosphorane (6.74 g, 21.99 mmol) in tetrahydrofuran (30 mL) was added drop-wise a solution of potassium tert-butoxide (3.08 g, 27.5 mmol) in THF at −30° C. under argon, and the mixture was stirred for 30 min. Then a solution of (R)-3′,4′-dihydro-2′H-spiro[[1,3]dioxolane-2,1′-naphthalene]-3′-carbaldehyde (4.0 g, 18.33 mmol) in THF was added drop-wise and reaction was stirred for 1 h at −30° C. Reaction was monitored by TLC. Reaction mixture quenched with water at −30° C. and allowed to RT, diluted with water (25 mL) and extracted with ethyl acetate (2×50 mL), dried over Na2SO4, filtered and concentrated to give crude product (8 g). The crude compound was purified with silica gel flash column chromatography (Biotage) to give (R)-3′-(2-methoxyvinyl)-3′,4′-dihydro-2′H-spiro[[1,3]dioxolane-2,1′-naphthalene] (3.5 g, 14.21 mmol, 78% yield) as colourless liquid; m/z 246.6.