反应详情

To a stirred solution of 1,2-diphenyl-2-propylamine (21.0 g, 0.085 mol) in chloroform (500 ml) under nitrogen was added N-CBZ-glycine (23.0 g, 0.11 mol), and then a solution of dicyclohexylcarbodiimide (20.6 g, 0.1 mol) in chloroform (100 ml) and the mixture stirred for 14 hours. The precipitated solid was removed by filtration and the solvent evaporated. The residue was dissolved in methylene chloride (500 ml), filtered and evaporated to a yellow oil. This was treated with ether (700 ml) and 500 ml of ice cold water, basified with 5 ml of 50% NaOH, the layers shaken and separated. The ether layer was washed with water (2×125 ml), dried and evaporated to an oil, 33.5 g. This was dissolved in methanol (500 ml) and 10% HCl (50 ml) and hydrogenated at 40 psi in a Parr apparatus over 3.0 g of 10% Pd/C catalyst for 4 hours. The catalyst was removed by filtration, and the solvent evaporated to a white solid. This was dissolved in 80 ml of hot methanol and treated with 200 ml of ether. Upon cooling a solid crystallised which was recrystallised from 100 ml of isopropanol and 100 ml of methanol to give 8.4 g of 2-amino-N-(1,2-diphenyl-1-methylethyl)acetamide hydrochloride which, after vacuum drying at 80 ° C. for 24 hours, had mp 253°-254° C.

1. customThe precipitated solid was removed by filtration
2. customthe solvent evaporated
3. dissolutionThe residue was dissolved in methylene chloride (500 ml)
4. filtrationfiltered
5. customevaporated to a yellow oil
6. additionThis was treated with ether (700 ml) and 500 ml of ice cold water
7. customseparated
8. washThe ether layer was washed with water (2×125 ml)
9. customdried
10. customevaporated to an oil, 33.5 g
11. dissolutionThis was dissolved in methanol (500 ml)
12. customThe catalyst was removed by filtration
13. customthe solvent evaporated to a white solid
14. dissolutionThis was dissolved in 80 ml of hot methanol
15. additiontreated with 200 ml of ether
16. temperatureUpon cooling a solid
17. customcrystallised which
18. customwas recrystallised from 100 ml of isopropanol and 100 ml of methanol