Methyl iodide → {[1-Bromo-6-(1-methyl-3-pentyl-1H-indol-2-yl)-2-naphthyl]oxy}acetic acid

HRID 495509Notes

Reaction equation

HRID 495509 reaction equation
C[O:2][C:3](=[O:31])[CH2:4][O:5][C:6]1[CH:15]=[CH:14][C:13]2[C:8](=[CH:9][CH:10]=[C:11]([C:16]3[NH:17][C:18]4[C:23]([C:24]=3[CH2:25][CH2:26][CH2:27][CH2:28][CH3:29])=[CH:22][CH:21]=[CH:20][CH:19]=4)[CH:12]=2)[C:7]=1[Br:30].[CH3:32]C([O-])(C)C.[K+].CI.[H-].[Na+]>C1COCC1>[Br:30][C:7]1[C:8]2[C:13](=[CH:12][C:11]([C:16]3[N:17]([CH3:32])[C:18]4[C:23]([C:24]=3[CH2:25][CH2:26][CH2:27][CH2:28][CH3:29])=[CH:22][CH:21]=[CH:20][CH:19]=4)=[CH:10][CH:9]=2)[CH:14]=[CH:15][C:6]=1[O:5][CH2:4][C:3]([OH:2])=[O:31]

Participants

6

Reactant 4

HCID 6328Methyl iodide2×HCID 24758Sodium hydrideHCID 23665647Potassium tert-butoxideHCID 57453746{[1-Bromo-6-(3-pentyl-1H-indol-2-yl)-2-naphthyl]oxy}acetic acid methyl ester

Product 1

HCID 10140643{[1-Bromo-6-(1-methyl-3-pentyl-1H-indol-2-yl)-2-naphthyl]oxy}acetic acidYield 57%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of {[1-bromo-6-(3-pentyl-1H-indol-2-yl)-2-naphthyl]oxy}acetic acid methyl ester (0.410 g, 0.853 mmol) in THF (20 mL) at 0° C. was added KOt-Bu (0.105 g, 0.938 mmol) followed by MeI (0.064 mL, 1.02 mmol). The reaction was warmed to rt and let stir for 1 h. It appeared by TLC and MS that all the starting material was gone; however, two polar acids (one N—Me and one N—H) had been generated due to hydrolysis in these basic conditions. After concentration, the residue was taken up in DMF (20 mL). Added NaH (0.075 g, 60% by wt., 1.88 mmol) followed by excess MeI to convert all intermediate to one acid (N—Me). After 1 h, the reaction mixture was concentrated and then diluted with EtOAc (200 mL) and 1 N HCl (20 mL). The organic layer was washed with H2O (20 mL) and brine (20 mL) and then dried (Na2SO4). After concentration, the residue was purified by preparatory plate chromatography (10% MeOH:CHCl3) to afford the product (0.232 g, 57%) as a yellowish-orange foamy solid, mp>73° C. (decomp.); 1H NMR (DMSO-d6) δ 0.73 (t, J=7.0 Hz, 3H), 1.11-1.20 (m, 4H), 1.50-1.58 (m, 2H), 2.66 (t, J=7.3 Hz, 2H), 3.58 (s, 3H), 4.93 (s, 2H), 7.07 (t, J=7.6 Hz, 1H), 7.19 (t, J=7.1 Hz, 1H), 7.42-7.48 (m, 2H), 7.58 (d, J=7.9 Hz, 1H), 7.68 (dd, J=1.7, 8.7 Hz, 1H), 7.99 (s, 1H), 8.04 (d, J=9.0 Hz, 1H), 8.21 (d, J=8.7 Hz, 1H), 11.95-14.75 (bs, 1H); IR (neat) 3050, 2955, 2925, 2850, 1725, 1670, 1600, 1480, 1470, 1430, 1370, 1325, 1275, 1220, 1190, 1145, 1095, 1015, 980, 925, 895, 830, 800, 765, 735, 700, and 665 cm−1; mass spectrum [(+) ESI], m/z 480/482 (M+H)+;

Workup

  1. customhowever, two polar acids (one N—Me and one N—H) had been generated due to hydrolysis in these basic conditions
  2. concentrationAfter concentration
  3. waitAfter 1 h
  4. concentrationthe reaction mixture was concentrated
  5. additiondiluted with EtOAc (200 mL) and 1 N HCl (20 mL)
  6. washThe organic layer was washed with H2O (20 mL) and brine (20 mL)
  7. dry with materialdried (Na2SO4)
  8. concentrationAfter concentration
  9. customthe residue was purified by preparatory plate chromatography (10% MeOH:CHCl3)

Sources & evidence

ORD record
ord-debcd6e3e5f2437bba89647caa23c950
Source dataset
uspto-grants-2005_09
Patent number
US06939886B2

Reaction notes

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