反应详情

To a solution of 2.383 g (8.4 mmoles) of crude 1-benzhydryl-3-hydroxyazetidine-3-carboxylic acid in 64 ml of 50% aqueous dioxane is added 2.1 ml of concentrated hydrochloric acid, and the mixture is catalytically hydrogenated for 32 hours in the presence of 924 mg of 10% palladium-charcoal under hydrogen pressure of 5 kg/cm2. The catalyst is filtered off and washed with an aqueous dioxane. The combined filtrate and washings are evaporated under reduced pressure during which the precipitating oily material is removed by washing with ether. The residue is washed with acetone and recrystallized from dimethylformamide-acetone to yield 1.051 g of 3-hydroxyazetidine-3-carboxylic acid hydrochloride as prisms in 82% yield.

1. filtrationThe catalyst is filtered off
2. washwashed with an aqueous dioxane
3. customThe combined filtrate and washings are evaporated under reduced pressure during which the precipitating oily material
4. customis removed
5. washby washing with ether
6. washThe residue is washed with acetone
7. customrecrystallized from dimethylformamide-acetone