Reacción #5522

Ecuación de reacción

(±)-6-cyano-4-(di-n-propylamino)-1,2,2a,3,4,5-hexahydrobenz[cd]indole

methylmagnesium bromide

diethyl ether

NH4Cl

→

oil

(+)-6-Acetyl-4-(di-n-propylamino)-1,2,2a,3,4,5-hexahydrobenz[cd]indole

Disolventes

benzene

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe reaction mixture was refluxed for 2 days
2. 2
   TemperaturaThe reaction mixture was cooled
3. 3
   OtroThe benzene layer was separated
4. 4
   Lavadowashed once with saturated NaCl solution
5. 5
   OtroThe organic solution was evaporated to an oil
6. 6
   workup.DISSOLUTIONThe oil was dissolved in 25 mL of 5N HCl
7. 7
   workup.ADDITIONwith the addition of excess concentrated NH4OH solution
8. 8
   ExtracciónThe basic mixture was extracted twice with CH2Cl2
9. 9
   LavadoThe combined organic solution was washed once with saturated NaCl solution
10. 10
    Secadodried over MgSO4
11. 11
    OtroThe CH2Cl2 solution was evaporated

Procedimiento

A solution of 0.5 g (1.8 mmol) of (±)-6-cyano-4-(di-n-propylamino)-1,2,2a,3,4,5-hexahydrobenz[cd]indole in 75 mL of benzene was treated with 5 mL of 2.0M methylmagnesium bromide in diethyl ether. The reaction mixture was refluxed for 2 days. The reaction mixture was cooled and excess Grignard reagent was decomposed with addition of saturated NH4Cl solution. The benzene layer was separated and washed once with saturated NaCl solution. The organic solution was evaporated to an oil. The oil was dissolved in 25 mL of 5N HCl and the solution was stirred at room temperature for 30 min. The acidic solution was made alkaline with the addition of excess concentrated NH4OH solution. The basic mixture was extracted twice with CH2Cl2. The combined organic solution was washed once with saturated NaCl solution and dried over MgSO4. The CH2Cl2 solution was evaporated to yield 0.5 g of an oil. Chromatography of this oil over silicia gel with ethyl acetate as eluent gave 0.4 g (75%) of product as an oil which upon standing solidified.

Fuente