反应详情

温度

105 °C

A solution of 0.31 g (1.21 mmol) of (±)-cis-4-(2-aminoethyl)-1,5-dioxaspiro[5.5]undecane-2-acetic acid and 0.504 g (1.20 mmol) of (±)-4-fluoro-α-[2-methyl-1-oxopropyl]-γ-oxo-N,β-diphenylbenzenebutane-amide mixture of [R-(R*,R*)], [R-(R*,S*)], [S-(R*,R*)] and [S-(R*,S*)] isomers in 5 mL of dimethyl sulfoxide is heated at 105° C. for 15 hours. The solution is cooled and poured into 100 mL of diethyl ether and 50 mL of saturated ammonium chloride in water. The layers are separated and the organic layer washed with water (2×50 mL) and 5% sodium hydroxide solution (2×100 mL--to extract the intermediate acid from unreacted diketone). The aqueous layer is acidified with dilute hydrochloric acid solution, stirred for three hours and extracted with 30 mL of ethyl acetate to remove the protecting group before lactonization. The extract is concentrated and dissolved in 30 mL of ethyl acetate. A drop of concentrated hydrochloric acid is added to the ethyl acetate solution and allowed to stand 18 hours. The solution is concentrated in vacuo and the concentrate is redissolved in 30 mL of ethyl acetate and treated with one drop of concentrated hydrochloric acid. The solution is stirred two hours, concentrated in vacuo, and dissolved in 6 mL of toluene. Trans-(±)-5-(4- fluoro-phenyl)-2-(1-methylethyl)-N,α-diphenyl-1-[2- (tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1H-pyrrole-3-carboxamide crystallizes and is isolated by filtration. A total of 0.155 g of trans-(±)-5-(4- fluorophenyl)-2-(1-methylethyl)-N,4-diphenyl-1-[2-(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1H-pyrrole-3-carboxamide is isolated in two crops.

1. temperatureThe solution is cooled
2. customThe layers are separated
3. washthe organic layer washed with water (2×50 mL) and 5% sodium hydroxide solution (2×100 mL
4. extractionto extract the intermediate acid from unreacted diketone)
5. extractionextracted with 30 mL of ethyl acetate
6. customto remove the protecting group before lactonization
7. concentrationThe extract is concentrated
8. dissolutiondissolved in 30 mL of ethyl acetate
9. additionA drop of concentrated hydrochloric acid is added to the ethyl acetate solution
10. waitto stand 18 hours
11. concentrationThe solution is concentrated in vacuo
12. dissolutionthe concentrate is redissolved in 30 mL of ethyl acetate
13. additiontreated with one drop of concentrated hydrochloric acid
14. stirringThe solution is stirred two hours
15. concentrationconcentrated in vacuo
16. dissolutiondissolved in 6 mL of toluene
17. customTrans-(±)-5-(4- fluoro-phenyl)-2-(1-methylethyl)-N,α-diphenyl-1-[2- (tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1H-pyrrole-3-carboxamide crystallizes
18. customis isolated by filtration