反应详情

A suspension of (6-phthalimidohexyl)phosphonic acid (2.34 g., 7.52 mmole) in dry benzene (10 ml.) is treated with phosphorus pentachloride (3.30 g., 15.9 mmole) and stirred at room temperature under argon for 45 minutes. The mixture is then refluxed for 15 minutes, cooled and evaporated to dryness (0.5 mm. Hg). The residue is taken up in dry tetrahydrofuran (10 ml.), cooled in an ice bath and treated dropwise with a solution of benzyl alcohol (0.81 g., 7.5 mmole) and triethylamine (1.05 ml., 7.59 mmole) in dry tetrahydrofuran (5 ml.) over a period of 20 minutes. The mixture is allowed to warm to room temperature, stirred for 30 minuted and then treated with a slight molar excess of L-phenylalanyl-L-leucine, phenylmethyl ester, hydrochloride salt. The resulting suspension is cooled in an ice-bath and treated dropwise with a solution of triethylamine (4.5 ml.) in tetrahydrofuran (8 ml.). The mixture is warmed to room temperature, stirred for 1.5 hours, diluted with ethyl acetate, filtered and evaporated. The residue is taken up in ethyl acetate and washed successively with 5% potassium bisulfate, saturated sodium bicarbonate, saturated sodium chloride, dried (Na2SO4), and evaporated. The residue is purified by flash chromatography on silica gel (100 g.) to give N-[N-[(phenylmethoxy)(6-phthalimidohexyl)phosphinyl]-L-phenylalanyl]-L-leucine, phenylmethyl ester.

1. temperatureThe mixture is then refluxed for 15 minutes
2. temperaturecooled
3. customevaporated to dryness (0.5 mm. Hg)
4. temperaturecooled in an ice bath
5. temperatureto warm to room temperature
6. stirringstirred for 30 minuted
7. temperatureThe resulting suspension is cooled in an ice-bath
8. temperatureThe mixture is warmed to room temperature
9. stirringstirred for 1.5 hours
10. filtrationfiltered
11. customevaporated
12. washwashed successively with 5% potassium bisulfate, saturated sodium bicarbonate, saturated sodium chloride
13. dry with materialdried (Na2SO4)
14. customevaporated
15. customThe residue is purified by flash chromatography on silica gel (100 g.)