2-ethyl-4-methylpentanoic acid

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: in tetrahydrofuran (40 ml) was dissolved in diisopropylamine (3.08 ml) and to the mixture was added n-butyl lithium (13.8 ml; 1.6 M hexane solution) at −78° C. and thereto was added isobutylbutyric acid (0.93 ml) dropwise and the mixture was stirred for 1 hour at 30° C. To the reaction mixture was added a solution of 4-isopropylbenzyl chloride (2.19 g) in tetrahydrofuran (10 ml) at −78° C. and the mixture was stirred at room temperature for 2 hours. The reaction mixture was poured to cool hydrochloric acid and was extracted with ethyl acetate. The extract was concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1) to give the title compound (1.73 g) having the following physical data. the mixture was stirred at room temperature for 2 hours The reaction mixture was poured was extracted with ethyl acetate The extract was concentrated The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1)

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: in tetrahydrofuran (40 ml) was dissolved in diisopropylamine (3.08 ml) and to the mixture was added n-butyl lithium (13.8 ml; 1.6 M hexane solution) at −78° C. and thereto was added isobutylbutyric acid (0.93 ml) dropwise and the mixture was stirred for 1 hour at 30° C. To the reaction mixture was added a solution of 4-isopropylbenzyl chloride (2.19 g) in tetrahydrofuran (10 ml) at −78° C. and the mixture was stirred at room temperature for 2 hours. The reaction mixture was poured to cool hydrochloric acid and was extracted with ethyl acetate. The extract was concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1) to give the title compound (1.73 g) having the following physical data. the mixture was stirred at room temperature for 2 hours The reaction mixture was poured was extracted with ethyl acetate The extract was concentrated The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1)

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: in tetrahydrofuran (40 ml) was dissolved in diisopropylamine (3.08 ml) and to the mixture was added n-butyl lithium (13.8 ml; 1.6 M hexane solution) at −78° C. and thereto was added isobutylbutyric acid (0.93 ml) dropwise and the mixture was stirred for 1 hour at 30° C. To the reaction mixture was added a solution of 4-isopropylbenzyl chloride (2.19 g) in tetrahydrofuran (10 ml) at −78° C. and the mixture was stirred at room temperature for 2 hours. The reaction mixture was poured to cool hydrochloric acid and was extracted with ethyl acetate. The extract was concentrated. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1) to give the title compound (1.73 g) having the following physical data. the mixture was stirred at room temperature for 2 hours The reaction mixture was poured was extracted with ethyl acetate The extract was concentrated The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1)