Hydrogen Peroxide → t-Butyl 3-(1-carboxycyclopentyl)propanoate

Participants

Reaction Steps

To a solution of crude 2-acetyl-2-[2-(tert-butoxycarbonyl)-ethyl]cyclohexanone (see Preparations 1 and 2) (42 g, 0.15 mol) in t-butanol (84 ml) was cautiously added a 30% aqueous hydrogen peroxide solution (21 ml, 0.187 mol) and conc. sulphuric acid (0.25 ml, 98% w/w) at room temperature, maintaining the reaction temperature below 50° C. during the addition. The mixture was stirred at room temperature for 18 hours, partitioned between dichloromethane (100 ml) and water (100 ml), and the layers separated. The dichloromethane layer was washed with 5% aqueous sodium sulphite solution (50 ml), dried over magnesium sulphate, filtered and concentrated under reduced pressure to give a pale yellow solid. (43 g). The solid partially crystallized on standing overnight to provide, after collecting and washing with pentane, the title compound, (15.5 g).

Provenance & Evidence