1-Propene, 1,1-diethoxy- → methyl trans-4-acetylamino-2,2-diethoxy-3,6-dimethyl-3,4-dihydro-2H-pyran-5-carboxylate

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Reaction Steps

1,1-Diethoxyprop-1-ene (1.0 ml) was added to a solution of methyl 2-acetylaminomethylene-3-oxobutanoate (1.0 g) and tris (6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octandionato)ytterbium (0.05 g) in toluene (3.0 ml) at 20° C. After stirring for 2 hr at ambient temperature, the reaction mixture was filtered to give methyl trans-4-acetylamino-2,2-diethoxy-3,6-dimethyl-3,4-dihydro-2H-pyran-5-carboxylate (1.05 g), m.p. 153°-4° C.

Provenance & Evidence