ethyl 5-methyl-4-oxohexanoate

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

Procedure: 2.8 ml (29 mmol) of piperidine and 1.7 ml (29 mmol) of acetic acid are added to a solution of 79 g (0.5 mol) of ethyl 4-methyl-3-oxo-pentanecarboxylate (prepared from methyl isopropyl ketone analogously to the process of S. B. Soloway and F. B. La Forge, J. Am. Chem. Soc. 69, 2677 (1947)) and 108 g (0.5 mol) of 4-fluoro-3-phenoxy-benzaldehyde in 300 ml of isopropanol and stirred overnight at RT. The mixture is then concentrated, the residue is taken up in 500 ml of ether, washed twice with water and once with saturated sodium chloride solution, dried over sodium sulphate and the solvent removed. The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar. All distillates (44 g) are discarded. The distillation residue contains the product: brownish oil (144.7 g, 81%), which is reacted further without purification. Rf =0.25 (petroleum ether/ethyl acetate 10:1). The mixture is then concentrated washed twice with water and once with saturated sodium chloride solution dried over sodium sulphate the solvent removed The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar brownish oil (144.7 g, 81%), which is reacted further without purification

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

Procedure: 2.8 ml (29 mmol of piperidine and 1.7 ml (29 mmol) of acetic acid are added to a solution of 79 g (0.5 mol) of ethyl 4-methyl-3-oxo-pentanecarboxylate (prepared from methyl isopropyl ketone analogously to the process of S. B. Soloway and F. B. La Forge, J. Am. Chem. Soc. 69, 2677 (1947)) and 108 g (0.5 mol) of 4-fluoro-3-phenoxy-benzaldehyde in 300 ml of isopropanol and stirred overnight at RT. The mixture is then concentrated, the residue is taken up in 500 ml of ether, washed twice with water and once with saturated sodium chloride solution, dried over sodium sulphate and the solvent removed. The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar. All distillates (44 g) are discarded. The distillation residue contains the product: brownish oil (144.7 g, 81%), which is reacted further without purification. The mixture is then concentrated washed twice with water and once with saturated sodium chloride solution dried over sodium sulphate the solvent removed The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar brownish oil (144.7 g, 81%), which is reacted further without purification

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

Procedure: 2.8 ml (29 mmol) of piperidine and 1.7 ml (29 mmol) of acetic acid are added to a solution of 79 g (0.5 mol) of ethyl 4-methyl-3-oxo-pentanecarboxylate (prepared from methyl isopropyl ketone analogously to the process of S. B. Soloway and F. B. La Forge, J. Am. Chem. Soc. 69, 2677 (1947)) and 108 g (0.5 mol) of 4-fluoro-3-phenoxy-benzaldehyde in 300 ml of isopropanol and stirred overnight at RT. The mixture is then concentrated, the residue is taken up in 500 ml of ether, washed twice with water and once with saturated sodium chloride solution, dried over sodium sulphate and the solvent removed. The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar. All distillates (44 g) are discarded. The distillation residue contains the product: brownish oil (144.7 g, 81%), which is reacted further without purification. Rf =0.25 (petroleum ether/ethyl acetate 10:1). The mixture is then concentrated washed twice with water and once with saturated sodium chloride solution dried over sodium sulphate the solvent removed The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar brownish oil (144.7 g, 81%), which is reacted further without purification

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

Procedure: 2.8 ml (29 mmol of piperidine and 1.7 ml (29 mmol) of acetic acid are added to a solution of 79 g (0.5 mol) of ethyl 4-methyl-3-oxo-pentanecarboxylate (prepared from methyl isopropyl ketone analogously to the process of S. B. Soloway and F. B. La Forge, J. Am. Chem. Soc. 69, 2677 (1947)) and 108 g (0.5 mol) of 4-fluoro-3-phenoxy-benzaldehyde in 300 ml of isopropanol and stirred overnight at RT. The mixture is then concentrated, the residue is taken up in 500 ml of ether, washed twice with water and once with saturated sodium chloride solution, dried over sodium sulphate and the solvent removed. The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar. All distillates (44 g) are discarded. The distillation residue contains the product: brownish oil (144.7 g, 81%), which is reacted further without purification. The mixture is then concentrated washed twice with water and once with saturated sodium chloride solution dried over sodium sulphate the solvent removed The residue is distilled under high vacuum until the last fraction passes over at 185° C. and 0.3 mbar brownish oil (144.7 g, 81%), which is reacted further without purification