反应详情

9.6 g (0.03 mol) of the N-hydroxysuccinimide ester of N-benzyloxycarbonyl-L-alanine and 5.26 g (0.03 mol) of dimethyl aminomethylphosphonate hydrochloride were stirred in 65 ml of dry dimethylformamide. While stirring and maintaining the temperature below 20° C, there were added dropwise 4.2 ml of dry triethylamine. The mixture was then stirred overnight at room temperature. The triethylamine hydrochloride was filtered off and washed with a little dimethylformamide. The filtrate was evaporated under an oil-pump vacuum and at a bath temperature below 40° C. The residual oil was treated with 40 ml of water and the resulting mixture extracted with four 40 ml portions of chloroform. The combined organic phases were washed with a small volume of a strong potassium carbonate solution and then dried over sodium sulphate. The sodium sulphate was filtered off and the filtrate evaporated first under a water-pump vacuum and then under an oil-pump vacuum. There were obtained 11.0 g of dimethyl [(N-benzyloxycarbonyl-L-alanyl)amino]-methylphosphonate as an oil with the expected N.M.R. spectrum.

1. temperaturemaintaining the temperature below 20° C, there
2. stirringThe mixture was then stirred overnight at room temperature
3. filtrationThe triethylamine hydrochloride was filtered off
4. washwashed with a little dimethylformamide
5. customThe filtrate was evaporated under an oil-pump vacuum and at a bath temperature below 40° C
6. additionThe residual oil was treated with 40 ml of water
7. extractionthe resulting mixture extracted with four 40 ml portions of chloroform
8. washThe combined organic phases were washed with a small volume of a strong potassium carbonate solution
9. dry with materialdried over sodium sulphate
10. filtrationThe sodium sulphate was filtered off
11. customthe filtrate evaporated first under a water-pump vacuum