4-methylpent-2-ynoic acid

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

Conditions: temp:22.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 38.2 g (280 mmol) of isobutyl chloroformate were added dropwise at 0 to 5° C., as well as 28.3 g (280 mmol) of N-methylmorpholine at 5 to 15° C., to a solution of 28.4 g (254 mmol) of 4-methyl-2-pentynoic acid (ex. 3) in 100 ml of tetrahydrofuran (THF). 46 g (254 mmol) of homoveratrylamine were subsequently added dropwise while cooling with ice and the mixture was allowed to stir at 20 to 25° C. for 48 hours. The reaction solution was then concentrated and the residue was poured into water/10% hydrochloric acid solution and extracted with MTBE. After drying, distilling off the volatile components and chromatographing on silica gel (cyclohexane:MTBE [3:1]), 44 g of the title compound were obtained. at 5 to 15° C. while cooling with ice The reaction solution was then concentrated the residue was poured into water/10% hydrochloric acid solution extracted with MTBE After drying distilling off the volatile components and chromatographing on silica gel (cyclohexane:MTBE [3:1])

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

Conditions: temp:22.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 38.2 g (280 mmol) of isobutyl chloroformate were added dropwise at 0 to 5° C., as well as 28.3 g (280 mmol) of N-methylmorpholine at 5 to 15° C., to a solution of 28.4 g (254 mmol) of 4-methyl-2-pentynoic acid (ex. 3) in 100 ml of tetrahydrofuran (THF). 46 g (254 mmol) of homoveratrylamine were subsequently added dropwise while cooling with ice and the mixture was allowed to stir at 20 to 25° C. for 48 hours. The reaction solution was then concentrated and the residue was poured into water/10% hydrochloric acid solution and extracted with MTBE. After drying, distilling off the volatile components and chromatographing on silica gel (cyclohexane:MTBE [3:1]), 44 g of the title compound were obtained. at 5 to 15° C. while cooling with ice The reaction solution was then concentrated the residue was poured into water/10% hydrochloric acid solution extracted with MTBE After drying distilling off the volatile components and chromatographing on silica gel (cyclohexane:MTBE [3:1])