tert-butyl 3-cyclopropyl-3-oxopropanoate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a stirred solution of tert-butyl 3-cyclopropyl-3-oxopropionate (9.2 g) in ethyl ether (200 mL) was added magnesium ethoxide (5.7 g). The reaction mixture was heated at reflux for 1 hour. After cooling back to room temperature, a solution of 2-methyl-3-ethoxy-4-methylsulfonylbenzoyl chloride (13.8 g), which was prepared from 2-methyl-3-ethoxy-4-methylsulfonylbenzoic acid (the preparation of which is described in U.S. Pat. No. 5,329,041 which is incorporated herein by reference) and oxalyl chloride, in ethyl ether (50 mL) was added over a period of 15 minutes. After stirring overnight at room temperature, the reaction mixture was poured over ice-water (100 mL), and the phases were separated. The ether layer was dried over magnesium sulfate and then concentrated in vacuo to afford 17 g of the crude product as an oil. The reaction mixture was heated at reflux for 1 hour the preparation of which the phases were separated The ether layer was dried over magnesium sulfate concentrated in vacuo

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 5-cyclopropylcarbonyl-2,2-dimethyl-1,3-dioxan-4,6-dione (23.9 g) and t-butanol (25 g) in dry toluene (80 ml) was stirred and heated at 80° C. for 4 hours. The cooled mixture was washed with water (3×30 ml), dried (anhydrous sodium sulphate), treated with decolourizing charcoal and filtered. The filtrate was evaporated to dryness and the residue was distilled to give t-butyl 3-cyclopropyl-3-oxopropionate (20.2 g) as a clear oil bp 80°-84° C./8 mmHg. The cooled mixture was washed with water (3×30 ml) dried (anhydrous sodium sulphate) treated with decolourizing charcoal filtered The filtrate was evaporated to dryness the residue was distilled

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 5-cyclopropylcarbonyl-2,2-dimethyl-1,3-dioxan-4,6-dione (23.9 g) and t-butanol (25 g) in dry toluene (80 ml) was stirred and heated at 80° C. for 4 hours. The cooled mixture was washed with water (3×30 ml), dried (anhydrous sodium sulphate), treated with decolourizing charcoal and filtered. The filtrate was evaporated to dryness and the residue was distilled to give t-butyl 3-cyclopropyl-3-oxopropionate (20.2 g) as a clear oil bp 80°-84° C./8 mmHg. The cooled mixture was washed with water (3×30 ml) dried (anhydrous sodium sulphate) treated with decolourizing charcoal filtered The filtrate was evaporated to dryness the residue was distilled

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 5-cyclopropylcarbonyl-2,2-dimethyl-1,3-dioxan-4,6-dione (23.9 g) and t-butanol (25 g) in dry toluene (80 ml) was stirred and heated at 80° C. for 4 hours. The cooled mixture was washed with water (3×30 ml), dried (anhydrous sodium sulphate), treated with decolourizing charcoal and filtered. The filtrate was evaporated to dryness and the residue was distilled to give t-butyl 3-cyclopropyl-3-oxopropionate (20.2 g) as a clear oil bp 80°-84° C./8 mmHg. The cooled mixture was washed with water (3×30 ml) dried (anhydrous sodium sulphate) treated with decolourizing charcoal filtered The filtrate was evaporated to dryness the residue was distilled

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Magnesium (3.0 g) was stirred in methanol, carbon tetrachloride (0.5 ml) added and the mixture warmed at 50° C. until the metal had dissolved (1.5 hours). Tert-butyl 3-cyclopropyl-3-oxopropanoate (20.0 g) was then added dropwise and the mixture heated under reflux conditions for 1 hour. The solvent was evaporated and re-evaporated after addition of toluene to give tert-butyl 3-cyclopropyl-3-oxopropanoate magnesium salt (29.9 g) as a white solid, m.p. >300° C., IR max (C═O) 1520, 1540; (C—O) 1350 cm−1. had dissolved (1.5 hours) the mixture heated under reflux conditions for 1 hour The solvent was evaporated re-evaporated after addition of toluene

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Magnesium (3.0 g) was stirred in methanol, carbon tetrachloride (0.5 ml) added and the mixture warmed at 50° C. until the metal had dissolved (1.5 hours). Tert-butyl 3-cyclopropyl-3-oxopropanoate (20.0 g) was then added dropwise and the mixture heated under reflux conditions for 1 hour. The solvent was evaporated and re-evaporated after addition of toluene to give tert-butyl 3-cyclopropyl-3-oxopropanoate magnesium salt (29.9 g) as a white solid, m.p. >300° C., IR max (C═O) 1520, 1540; (C—O) 1350 cm−1. had dissolved (1.5 hours) the mixture heated under reflux conditions for 1 hour The solvent was evaporated re-evaporated after addition of toluene

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Magnesium (3.0 g) was stirred in methanol, carbon tetrachloride (0.5 ml) added and the mixture warmed at 50° C. until the metal had dissolved (1.5 hours). Tert-butyl 3-cyclopropyl-3-oxopropanoate (20.0 g) was then added dropwise and the mixture heated under reflux conditions for 1 hour. The solvent was evaporated and re-evaporated after addition of toluene to give tert-butyl 3-cyclopropyl-3-oxopropanoate magnesium salt (29.9 g) as a white solid, m.p.>300° C., IR max (C=O) 1520, 1540; (C--O) 1350 cm-1. had dissolved (1.5 hours) the mixture heated under reflux conditions for 1 hour The solvent was evaporated re-evaporated after addition of toluene

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Magnesium (3.0 g) was stirred in methanol, carbon tetrachloride (0.5 ml) added and the mixture warmed at 50° C. until the metal had dissolved (1.5 hours). Tert-butyl 3-cyclopropyl-3-oxopropanoate (20.0 g) was then added dropwise and the mixture heated under reflux conditions for 1 hour. The solvent was evaporated and re-evaporated after addition of toluene to give tert-butyl 3-cyclopropyl-3-oxopropanoate magnesium salt (29.9 g) as a white solid, m.p.>300° C., IR max (C=O) 1520, 1540; (C--O) 1350 cm-1. had dissolved (1.5 hours) the mixture heated under reflux conditions for 1 hour The solvent was evaporated re-evaporated after addition of toluene