Реакция #5522

Уравнение реакции

(±)-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

Растворители

benzene

Условия реакции

Обработка

1. 1
   ТемператураThe reaction mixture was refluxed for 2 days
2. 2
   ТемператураThe reaction mixture was cooled
3. 3
   ДругоеThe benzene layer was separated
4. 4
   Промывкаwashed once with saturated NaCl solution
5. 5
   ДругоеThe 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
   ЭкстракцияThe basic mixture was extracted twice with CH2Cl2
9. 9
   ПромывкаThe combined organic solution was washed once with saturated NaCl solution
10. 10
    Сушкаdried over MgSO4
11. 11
    ДругоеThe CH2Cl2 solution was evaporated

Методика

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.

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