反应详情

温度

0 °C

1 ml (11.4 mmol) of 1-bromo-2-butyne is added to a suspension of 1.4 g (34.2 mmol) of sodium hydride at 60% in 14 ml of dimethylformamide cooled beforehand to 0° C. After stirring for 1 h, 3 g (11.4 mmol) of tert-butyl 3-hydroxy-3-o-tolylazetidine-1-carboxylate in 20 ml of dimethylformamide are added dropwise and the reaction mixture is then stirred for 1 h 30. After hydrolysis with water and with a saturated aqueous solution of ammonium chloride, the reaction medium is extracted with a 1/1 heptane/ethyl acetate mixture. The organic phase is dried over sodium sulphate, filtered and concentrated. The residue obtained is purified by silica gel chromatography, elution being carried out with a 80/20 heptane/ethyl acetate mixture. 2.9 g of tert-butyl 3-but-2-ynyloxy-3-o-tolylazetidine-1-carboxylate are obtained in the form of a yellow oil with a yield of 81%.

1. stirringthe reaction mixture is then stirred for 1 h 30
2. extractionwith a saturated aqueous solution of ammonium chloride, the reaction medium is extracted with a 1/1 heptane/ethyl acetate mixture
3. dry with materialThe organic phase is dried over sodium sulphate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue obtained
7. customis purified by silica gel chromatography, elution