2-Methyl-2-butene → 4,6-difluoro-5-[4-(3-hydroxypropoxy)phenyl]-1H-indole-3-carboxylic acid

HRID 1054642Notes

Reaction equation

[F:1][C:2]1[C:10]([C:11]2[CH:16]=[CH:15][C:14]([O:17][CH2:18][CH2:19][CH2:20][OH:21])=[CH:13][CH:12]=2)=[C:9]([F:22])[CH:8]=[C:7]2[C:3]=1[C:4]([CH:23]=[O:24])=[CH:5][NH:6]2.CC(=CC)C.Cl([O-])=[O:31].[Na+].P([O-])(O)(O)=O.[Na+]>C(#N)C.C(O)(C)(C)C.O>[F:1][C:2]1[C:10]([C:11]2[CH:12]=[CH:13][C:14]([O:17][CH2:18][CH2:19][CH2:20][OH:21])=[CH:15][CH:16]=2)=[C:9]([F:22])[CH:8]=[C:7]2[C:3]=1[C:4]([C:23]([OH:31])=[O:24])=[CH:5][NH:6]2

Participants

Conditions

Temperature: 0 °C

Procedure

To a mixture of 4,6-difluoro-5-[4-(3-hydroxypropoxy)phenyl]-1H-indole-3-carbaldehyde (30 mg, 0.1 mmol) in ACN/t-butanol=1/1 (2 mL) was added 2-methyl-2-butene (0.5 mL) and cooled to 0° C. and added the aqueous solution of sodium chlorite (180 mg, 0.5 mL) and sodium dihydrogen phosphate (270 mg, 2 mmol) in water (0.5 mL) dropwise via additional funnel. The reaction was stirred at room temperature for 10 h. The reaction was quenched with sodium sulfite. The mixture was partioned between dichloromethane and water. The combined organics were concentrated to give a residue, which was purified by reverse phase HPLC to give the title compound (15 mg, 43%) as a white solid. MS (AP+) 348.1 (M+H)+. 1H NMR (400 MHz, CD3OD) δ 7.74 (s, 1 H), 7.36 (d, 2 H), 7.03-6.98 (m, 3 H), 4.14 (t, 2 H), 3.77 (t, 2 H), 2.04-2.01 (m, 2 H).

Workup

customThe reaction was quenched with sodium sulfite
concentrationThe combined organics were concentrated
customto give a residue, which
customwas purified by reverse phase HPLC

Sources & evidence

ORD record: ord-bf2ded9fcd7d4ebb91659b745eed90a1
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09394285B2

Reaction notes

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