ethyl (1R,2R)-2-formylcyclopropane-1-carboxylate

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

Procedure: Cool a solution of (+/−)-trans-2-hydroxymethyl-cyclopropanecarboxylic acid ethyl ester (0.22 g, 1.53 mmol) in 1.5 mL DMSO to 0° C. Add to the frozen solution triethyl-amine (0.85 mL, 0.62 mmol) followed by sulfur trioxide pyridine (0.49 g, 3.05 mmol). Warm reaction mixture to 12° C. over 3.5 hours, dilute with diethyl ether (80 mL), and wash with 5% aqueous citric acid (3×20 mL) followed by saturated aqueous sodium chloride (1×20 mL). Dry over magnesium sulfate and concentrate under reduced pressure to provide the desired compound. Warm reaction mixture to 12° C. over 3.5 hours wash with 5% aqueous citric acid (3×20 mL) Dry over magnesium sulfate concentrate under reduced pressure

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

Procedure: Cool a solution of (+/−)-trans-2-hydroxymethyl-cyclopropanecarboxylic acid ethyl ester (0.22 g, 1.53 mmol) in 1.5 mL DMSO to 0° C. Add to the frozen solution triethyl-amine (0.85 mL, 0.62 mmol) followed by sulfur trioxide pyridine (0.49 g, 3.05 mmol). Warm reaction mixture to 12° C. over 3.5 hours, dilute with diethyl ether (80 mL), and wash with 5% aqueous citric acid (3×20 mL) followed by saturated aqueous sodium chloride (1×20 mL). Dry over magnesium sulfate and concentrate under reduced pressure to provide the desired compound. Warm reaction mixture to 12° C. over 3.5 hours wash with 5% aqueous citric acid (3×20 mL) Dry over magnesium sulfate concentrate under reduced pressure

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

Procedure: Cool a solution of (+/−)-trans-2-hydroxymethyl-cyclopropanecarboxylic acid ethyl ester (0.22 g, 1.53 mmol) in 1.5 mL DMSO to 0° C. Add to the frozen solution triethyl-amine (0.85 mL, 0.62 mmol) followed by sulfur trioxide pyridine (0.49 g, 3.05 mmol). Warm reaction mixture to 12° C. over 3.5 hours, dilute with diethyl ether (80 mL), and wash with 5% aqueous citric acid (3×20 mL) followed by saturated aqueous sodium chloride (1×20 mL). Dry over magnesium sulfate and concentrate under reduced pressure to provide the desired compound. Warm reaction mixture to 12° C. over 3.5 hours wash with 5% aqueous citric acid (3×20 mL) Dry over magnesium sulfate concentrate under reduced pressure