Bromine → Acetic acid 2-cyclopentyl-4-(9-bromo-2,3-dimethyl-naphtho[2,3-b]thiophen-4-yl)-phenyl ester

HRID 1069232Notes

Reaction equation

HRID 1069232 reaction equation
[CH:1]1([C:6]2[CH:11]=[C:10]([C:12]3[C:24]4[C:23]([CH3:25])=[C:22]([CH3:26])[S:21][C:20]=4[CH:19]=[C:18]4[C:13]=3[CH:14]=[CH:15][CH:16]=[CH:17]4)[CH:9]=[CH:8][C:7]=2[O:27][C:28](=[O:30])[CH3:29])[CH2:5][CH2:4][CH2:3][CH2:2]1.[Br:31]Br>C(Cl)Cl>[CH:1]1([C:6]2[CH:11]=[C:10]([C:12]3[C:24]4[C:23]([CH3:25])=[C:22]([CH3:26])[S:21][C:20]=4[C:19]([Br:31])=[C:18]4[C:13]=3[CH:14]=[CH:15][CH:16]=[CH:17]4)[CH:9]=[CH:8][C:7]=2[O:27][C:28](=[O:30])[CH3:29])[CH2:2][CH2:3][CH2:4][CH2:5]1

Participants

4

Reactant 2

HCID 24408BromineHCID 53716940Acetic acid 2-cyclopentyl-4-(2,3-dimethyl-naphtho[2,3-b]thiophen-4-yl)-phenyl ester

Product 1

HCID 54419856Acetic acid 2-cyclopentyl-4-(9-bromo-2,3-dimethyl-naphtho[2,3-b]thiophen-4-yl)-phenyl esterYield 79%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
-78 °C

Procedure

To acetic acid 2-cyclopentyl-4-(2,3-dimethyl-naphtho[2,3-b]thiophen-4-yl)-phenyl ester (2.9 g, 7.7 mmol) in anhydrous methylene chloride (68 mL) was added ferric chloride (66 mg, 0.41 mmol). The reaction mixture was placed under nitrogen and cooled to −78° C. The reaction mixture was protected from light and a solution of bromine (0.44 mL, 8.5 mmol) in anhydrous methylene chloride (11 mL) was added dropwise over a period of 15 min. After stirring at −78° C. for 45 min the reaction was quenched with dilute sodium bisulfite, and then poured into water (200 mL). The resulting mixture was extracted with diethyl ether (300 mL), and the diethyl ether layer was washed with water and then brine. Concentration under reduced pressure and chromatography with petroleum ether:ethyl acetate (95:5) gave the title compound as a white solid (2.7 g, 79%): (CDCl3): δ8.28 (d, 1H), 7.58-7.52 (m, 2H), 7.39-7.34 (m, 1H), 7.29 (d, 1H), 7.18 (dd, 1H), 7.14 and 7.13 (d, 1H), 3.18 (quintet, 1H), 2.44 (s, 3H), 2.40 (s, 3H), 2.06-2.02 (m, 2H), 1.75-1.45 (m containing a singlet at δ1.60, 9H); MS(EI): [M+], 1 bromine isotope pattern, 492/494; Anal. Calc. for C27H25BrO2S: C, 65.72; H, 5.11; N, 0.00. Found: C, 63.18; H, 4.96; N, 0.00.

Workup

  1. customwas quenched with dilute sodium bisulfite
  2. additionpoured into water (200 mL)
  3. extractionThe resulting mixture was extracted with diethyl ether (300 mL)
  4. washthe diethyl ether layer was washed with water
  5. concentrationConcentration under reduced pressure and chromatography with petroleum ether:ethyl acetate (95:5)

Sources & evidence

ORD record
ord-94c874967c9441999c7b5aa3cdb4bb34
Source dataset
uspto-grants-2001_06
Patent number
US06251936B1

Reaction notes

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