반응 #1552066

반응 방정식

n-BuLi

H2SO4

Isopropyl methyl ketone

2-bromo-N-methyl-N-phenylaniline

→

desired compound

수율 64.9%

9-Isopropyl-9,10-dimethyl-9,10-dihydroacridine

수율 64.9%

용매

THF

반응 조건

후처리

1. 1
   온도to warm to room temperature
2. 2
   workup.STIRRINGstirred overnight under argon
3. 3
   기타After quenching with saturated ammonium chloride
4. 4
   추출the reaction was extracted with Et2O
5. 5
   세척washed with brine and water
6. 6
   건조dried over anhydrous MgSO4
7. 7
   기타the solvent evaporated under reduced pressure
8. 8
   기타To the neat residue thus obtained
9. 9
   workup.STIRRINGthe mixture stirred at room temperature for 1 h under argon
10. 10
    추출After dilution with 30 mL DI H2O, the reaction was extracted with Et2O (5×50 mL)
11. 11
    세척washed with brine and water
12. 12
    건조dried over anhydrous MgSO4
13. 13
    기타the solvent was evaporated under reduced pressure
14. 14
    기타The residue was purified by flash column chromatography

실험 절차

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. Isopropyl methyl ketone (0.361 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 0.62 g (60%) of the desired compound as a clear oil. 1H NMR (400 MHz, CHCl3) δ 1.51 (s, 3H), 1.64 (s, 3H), 1.70 (s, 3H), 3.04 (s, 3H), 6.64 (m, 3H), 7.12 (m, 6H). 13C NMR (100 MHz, CHCl3) δ 21.5, 22.2, 23.8, 31.8, 39.0, 114.6, 117.4, 120.6, 121.4, 125.1, 127.4, 127.8, 128.0, 128.7, 129.3, 133.6, 140.0, 141.1, 147.2, 149.5. HRMS (ESI) calc for C18H21N [M+H]+ 252.1747, found 252.1742. IR (KBr plate) 692 (m), 747 (s), 1137 (m), 1342 (m), 1443 (m), 1486 (s), 1499 (s), 1591 (s), 1601 (s), 2911 (m), 2984 (m) cm−1.

출처