ethyl 5-oxo-1,2,3,4,6,6a-hexahydropentalene-3a-carboxylate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methyl 5-oxo-1,2,3,3a,4,5-hexahydropentalene-3a-carboxylate (2.5 g, 12.8 mmol) in ethanol (25 mL) was purged with nitrogen for about 10 minutes with stirring. Palladium on carbon (0.043 g, 20 mol %) was added and the reaction vessel was purged with nitrogen for about 10 minutes. The flow of nitrogen was stopped and the flask was flushed with hydrogen. The reaction mixture was stirred overnight under an atmosphere of hydrogen. The flask was flushed with nitrogen for about 20 minutes. The reaction mixture was passed through a pad of Celite® and the filtrate was concentrated in vacuo. The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane) to afford ethyl 2-oxooctahydropentalene-3a-carboxylate (2.04 g, 10.4 mmol, 81%). the reaction vessel was purged with nitrogen for about 10 minutes the flask was flushed with hydrogen The reaction mixture was stirred overnight under an atmosphere of hydrogen The flask was flushed with nitrogen for about 20 minutes the filtrate was concentrated in vacuo The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methyl 5-oxo-1,2,3,3a,4,5-hexahydropentalene-3a-carboxylate (2.5 g, 12.8 mmol) in ethanol (25 mL) was purged with nitrogen for about 10 minutes with stirring. Palladium on carbon (0.043 g, 20 mol %) was added and the reaction vessel was purged with nitrogen for about 10 minutes. The flow of nitrogen was stopped and the flask was flushed with hydrogen. The reaction mixture was stirred overnight under an atmosphere of hydrogen. The flask was flushed with nitrogen for about 20 minutes. The reaction mixture was passed through a pad of Celite® and the filtrate was concentrated in vacuo. The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane) to afford ethyl 2-oxooctahydropentalene-3a-carboxylate (2.04 g, 10.4 mmol, 81%). the reaction vessel was purged with nitrogen for about 10 minutes the flask was flushed with hydrogen The reaction mixture was stirred overnight under an atmosphere of hydrogen The flask was flushed with nitrogen for about 20 minutes the filtrate was concentrated in vacuo The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methyl 5-oxo-1,2,3,3a,4,5-hexahydropentalene-3a-carboxylate (2.5 g, 12.8 mmol) in ethanol (25 mL) was purged with nitrogen for about 10 minutes with stirring. Palladium on carbon (0.043 g, 20 mol %) was added and the reaction vessel was purged with nitrogen for about 10 minutes. The flow of nitrogen was stopped and the flask was flushed with hydrogen. The reaction mixture was stirred overnight under an atmosphere of hydrogen. The flask was flushed with nitrogen for about 20 minutes. The reaction mixture was passed through a pad of Celite® and the filtrate was concentrated in vacuo. The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane) to afford ethyl 2-oxooctahydropentalene-3a-carboxylate (2.04 g, 10.4 mmol, 81%). the reaction vessel was purged with nitrogen for about 10 minutes the flask was flushed with hydrogen The reaction mixture was stirred overnight under an atmosphere of hydrogen The flask was flushed with nitrogen for about 20 minutes the filtrate was concentrated in vacuo The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methyl 5-oxo-1,2,3,3a,4,5-hexahydropentalene-3a-carboxylate (2.5 g, 12.8 mmol) in ethanol (25 mL) was purged with nitrogen for about 10 minutes with stirring. Palladium on carbon (0.043 g, 20 mol %) was added and the reaction vessel was purged with nitrogen for about 10 minutes. The flow of nitrogen was stopped and the flask was flushed with hydrogen. The reaction mixture was stirred overnight under an atmosphere of hydrogen. The flask was flushed with nitrogen for about 20 minutes. The reaction mixture was passed through a pad of Celite® and the filtrate was concentrated in vacuo. The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane) to afford ethyl 2-oxooctahydropentalene-3a-carboxylate (2.04 g, 10.4 mmol, 81%). the reaction vessel was purged with nitrogen for about 10 minutes the flask was flushed with hydrogen The reaction mixture was stirred overnight under an atmosphere of hydrogen The flask was flushed with nitrogen for about 20 minutes the filtrate was concentrated in vacuo The residue was purified by flash column chromatography (eluting with 25% ethyl acetate/heptane)