Reacción #954

Ecuación de reacción

4-(N-tert-butyloxycarbonylaminomethyl) piperidine

N-benzyloxycarbonyl-S-methylisothiourea

→

title product

Rendimiento 37.0%

4-(N-tert-butyloxycarbonylaminomethyl)-1-(N-benzyloxycarbon ylamidino) piperidine

Rendimiento 37.0%

Disolventes

ethanol

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe mixture was heated at 60°-70° C. for six hours
2. 2
   OtroThe solvent was evaporated
3. 3
   workup.DISSOLUTIONthe residue was dissolved in CH2Cl2
4. 4
   LavadoThe organic layer was washed twice with 0.3M KHSO4 and once with brine
5. 5
   SecadoThe combined organic layer was dried (Na2SO4)
6. 6
   Filtraciónfiltered
7. 7
   Otroevaporated
8. 8
   OtroThe crude product was purified by flash chromatography

Procedimiento

7.8 g (36.4 mmole) of 4-(N-tert-butyloxycarbonylaminomethyl) piperidine and 8.98 g (40 mmole) of N-benzyloxycarbonyl-S-methylisothiourea was mixed in 25 mL ethanol. The mixture was heated at 60°-70° C. for six hours and left at room temperature for two days. The solvent was evaporated and the residue was dissolved in CH2Cl2. The organic layer was washed twice with 0.3M KHSO4 and once with brine. The combined organic layer was dried (Na2SO4), filtered and evaporated. The crude product was purified by flash chromatography using a stepwise gradient of CH2Cl2 /MeOH (100/0, 97/3, 95/5, 90/10) as eluent to yield 5.22 g (37%) of the title product.

Fuente