反应详情

DBU (0.209 mL, 1.40 mmol) was added to a stirred solution of 2,2,2-trichloroethyl 2-[4-chloro-2-(hydroxymethyl)phenyl]azetidine-1-carboxylate (0.346 g, 0.927 mmol) and DPPA (0.302 mL, 1.40 mmol) in THF (2 mL) at 0° C. After 2 h the reaction was partitioned between ether and water and the organic layer was washed with 1 M sodium hydroxide solution (2 times) and 1 M HCl solution, dried (Na2SO4) and evaporated in vacuo to an oil. Triphenylphosphine (0.262 g, 1.00 mmol) was added to a stirred solution of this oil in THF (2 mL) and water (4 drops). After 16 h methanol (2 mL), water (1 mL) and sodium hydroxide (1 pellet) were added, the mixture was stirred for a further 15 min and then was partitioned between ether and water. The organic layer was extracted into dilute aqueous acetic acid which was basicified with sodium hydroxide and extracted with ether. This organic layer was dried (Na2SO4) and evaporated in vacuo to an oil which was purified by flash column chromatography on silica (eluting with a chloroform/10% ammonium hydroxide in methanol gradient, 1-4% ammonium hydroxide/methanol) to give 2,2,2-trichloroethyl 2-[2-(aminomethyl)-4-chlorophenyl]azetidine-1-carboxylate (275 mg) as an oil: 1H NMR (CDCl3, 400 MHz) δ 2.11 (m, 1H), 2.78 (m, 1H), 3.77 (br d, J=14.4 Hz, 1H), 3.87 (br d, J=14.4 Hz, 1H), 4.16 (br m, 2H), 4.64 (br m, 2H), 5.63 (br s, 1H), 7.27 (obscured m, 1H), 7.35 (s, 1H), 7.50 (br s, 1H).

1. customAfter 2 h the reaction was partitioned between ether and water
2. washthe organic layer was washed with 1 M sodium hydroxide solution (2 times) and 1 M HCl solution
3. dry with materialdried (Na2SO4)
4. customevaporated in vacuo to an oil
5. customwas partitioned between ether and water
6. extractionThe organic layer was extracted into dilute aqueous acetic acid which
7. extractionextracted with ether
8. dry with materialThis organic layer was dried (Na2SO4)
9. customevaporated in vacuo to an oil which
10. customwas purified by flash column chromatography on silica (
11. washeluting with a chloroform/10% ammonium hydroxide in methanol gradient, 1-4% ammonium hydroxide/methanol)