Реакция #1552065

Уравнение реакции

n-BuLi

H2SO4

Methyl ethyl ketone

2-bromo-N-methyl-N-phenylaniline

→

desired compound

Выход 57.0%

9-Ethyl-9,10-dimethyl-9,10-dihydroacridine

Выход 57.0%

Растворители

THF

Условия реакции

Обработка

1. 1
   Температураto warm to room temperature
2. 2
   workup.STIRRINGstirred overnight under argon
3. 3
   ДругоеAfter quenching with saturated ammonium chloride
4. 4
   Экстракцияthe reaction was extracted with Et2O
5. 5
   Промывкаwashed with brine and water
6. 6
   Сушкаdried over anhydrous MgSO4
7. 7
   Другоеthe solvent evaporated under reduced pressure
8. 8
   ДругоеTo the neat residue thus obtained
9. 9
   workup.STIRRINGthe mixture stirred at room temperature for 1 h under argon
10. 10
    ЭкстракцияAfter dilution with 30 mL DI H2O, the reaction was extracted with Et2O (5×50 mL)
11. 11
    Промывкаwashed with brine and water
12. 12
    Сушкаdried over anhydrous MgSO4
13. 13
    Другоеthe solvent was evaporated under reduced pressure
14. 14
    ДругоеThe residue was purified by flash column chromatography

Методика

A flame-dried two-necked flask was charged with 2-bromo-N-methyl-N-phenylaniline (1.0 g, 3.8 mmol) and 100 mL dry THF under argon and cooled to −78° C. in a dry ice-acetone bath. 2.6 mL of a 1.6 M solution of n-BuLi in hexanes (4.16 mmol) was added dropwise over 5 minutes and the reaction stirred at −78° C. under argon for 1 h. Methyl ethyl ketone (0.302 g, 4.2 mmol) was added in one portion to the reaction mixture at −78° C., the reaction allowed to warm to room temperature and stirred overnight under argon. After quenching with saturated ammonium chloride, the reaction was extracted with Et2O, the organic layers combined, washed with brine and water and dried over anhydrous MgSO4 and the solvent evaporated under reduced pressure. To the neat residue thus obtained was added 2 mL of concentrated H2SO4 under argon and the mixture stirred at room temperature for 1 h under argon. After dilution with 30 mL DI H2O, the reaction was extracted with Et2O (5×50 mL), the organic layers were combined, washed with brine and water and dried over anhydrous MgSO4, and the solvent was evaporated under reduced pressure. The residue was purified by flash column chromatography using hexanes as the eluent to yield 0.57 g (57%) of the desired compound as a clear oil. 1H NMR (400 MHz, CHCl3) δ 1.66 (dd, J=6.8 Hz, J=0.8 Hz, 3H), 1.78 (t, J=1.2 Hz, 3H), 3.10 (s, 3H), 5.49 (m, 1H), 6.66 (m, 3H), 7.18 (m, 6H). 13C NMR (100 MHz, CHCl3) δ 14.2, 15.2, 16.5, 24.2, 39.2, 39.6, 113.8, 114.1, 117.1, 117.4, 122.4, 124.4, 125.7025.9, 128.0, 128.2, 128.5, 128.8, 128.9, 130.6, 131.5, 136.4, 140.4, 144.3, 145.8, 146.9, 149.2, 149.4. HRMS (ESI) calc for C17H19N [M+H]+ 238.1590, found 238.1587. IR (KBr plate) 692 (m), 747 (m), 1345 (m), 1444 (m), 1499 (s), 1592 (s), 1602 (s), 2918 (m), 3024 (m) cm−1.

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