反应详情

(E)-benzaldehyde oxime (Sigma Aldrich; 3.3 g, 20 mmol) in tert butanol and water (1:1) 80 mL, is treated with chloramine T trihydrate (Sigma Aldrich; 5.9 g, 21 mmol) in small, portions over 5 min. The reaction is then treated with copper sulfate pentahydrate (0.15 g, 0.6 mmol) and copper turnings ˜50 mg and tributylethynylstannane (6.3 g, 20 mmol). The reaction is then adjusted to pH 6 with sodium hydroxide solution and stirred for 6 h. The reaction mixture is treated with dilute ammonium hydroxide solution to remove all copper salts. The product is collected by filtration, redissolved in ethyl acetate and filtered through a short plug of silica gel. The filtrate is concentrated in vacuo to give 3-phenyl-5-(tributylstannyl) isoxazole.

1. customto remove all copper salts
2. filtrationThe product is collected by filtration
3. dissolutionredissolved in ethyl acetate
4. filtrationfiltered through a short plug of silica gel
5. concentrationThe filtrate is concentrated in vacuo