2-Methyl-2-butene → 6-chloro-5-[4-(oxetan-3-ylmethoxy)phenyl]-1H-indole-3-carboxylic acid

HRID 1054783Notes

Reaction equation

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

Participants

Conditions

Temperature: 0 °C

Procedure

To a mixture of 6-chloro-5-[4-(oxetan-3-ylmethoxy)phenyl]-1H-indole-3-carbaldehyde (70 mg, 0.2 mmol) in acetonitrile/t-butanol=1/1 (5 mL) was added 2-methyl-2-butene (0.5 mL). The reaction was cooled to 0° C. and an aqueous solution of sodium chlorite (180 mg, 2.00 mmol) and sodium dihydrogen phosphate (270 mg, 6.00 mmol) in water (0.5 mL) were added dropwise via additional funnel. Then ice bath was removed, the reaction was stirred at room temperature for 12 h. The reaction was quenched with sodium sulfite. The mixture was partitioned between EtOAc (20 mL×3) and water. The combined organics was concentrated to give a residue, which was purified by reverse phase HPLC to give the title compound (25 mg, 35% yield) as an off-white solid. MS (AP+) 358.1 (M+H)+. 1H NMR (400 MHz, DMSO-d6) δ 8.04 (s, 1H), 7.95 (s, 1H), 7.61 (s, 1H), 7.35 (d, 2H), 7.04 (d, 2H), 4.74 (t, 2H), 4.46 (t, 2H), 4.26 (t, 2H), 3.44-3.42 (m, 1H).

Workup

customThen ice bath was removed
customThe reaction was quenched with sodium sulfite
customThe mixture was partitioned between EtOAc (20 mL×3) and water
concentrationThe combined organics was concentrated
customto give a residue, which
customwas purified by reverse phase HPLC

Sources & evidence

ORD record: ord-1f9b204b7cc1491497e6ea977054f780
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09394285B2

Reaction notes

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