Reacción #44338

Ecuación de reacción

propargyl bromide

tert-butyl-1-piperazine carboxylate

propargyl bromide

potassium carbonate

→

yellow oil

Rendimiento 46.0%

4-Prop-2-ynyl-piperazine-1-carboxylic acid tert-butyl ester

Rendimiento 46.0%

Disolventes

dichloromethane

acetonitrile

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe residue was evaporated to dryness
2. 2
   workup.ADDITIONDichloromethane, 50 mL, and water, 50 mL, were added
3. 3
   ExtracciónThe reaction mixture was extracted with CH2Cl2, 4×40 mL
4. 4
   Secadodried over magnesium sulfate
5. 5
   Otroevaporate
6. 6
   Otroto provide a brown oil
7. 7
   Otropurify with a RT Scientific system

Procedimiento

To a solution of 10.0 g (54.8 mmol) of tert-butyl-1-piperazine carboxylate in 60 mL acetonitrile was added 5.20 mL (60.4 mmol) propargyl bromide and 37.9 g (274 mmol) anhydrous potassium carbonate. Additional propargyl bromide, 1.5 mL, was added after stirring for 36 hours at room temperature. The residue was evaporated to dryness. Dichloromethane, 50 mL, and water, 50 mL, were added. The reaction mixture was extracted with CH2Cl2, 4×40 mL, dried over magnesium sulfate, and evaporate to provide a brown oil. The oil was dissolved in dichloromethane and purify with a RT Scientific system using hexane/ethyl acetate gradient to yield 5.5 g (46%) of yellow oil, which ultimately crystallized upon standing.

Fuente