Ethyl isocyanate → 1-[3-(3-cyano-1-ethyl-6-methoxy-1H-indol-2-ylethynyl)-phenyl]-3-ethyl urea

HRID 506036Notes

Reaction equation

[NH2:1][C:2]1[CH:3]=[C:4]([C:8]#[C:9][C:10]2[N:11]([CH2:23][CH3:24])[C:12]3[C:17]([C:18]=2[C:19]#[N:20])=[CH:16][CH:15]=[C:14]([O:21][CH3:22])[CH:13]=3)[CH:5]=[CH:6][CH:7]=1.[CH2:25]([N:27]=[C:28]=[O:29])[CH3:26]>N1C=CC=CC=1.CCOC(C)=O>[C:19]([C:18]1[C:17]2[C:12](=[CH:13][C:14]([O:21][CH3:22])=[CH:15][CH:16]=2)[N:11]([CH2:23][CH3:24])[C:10]=1[C:9]#[C:8][C:4]1[CH:3]=[C:2]([NH:1][C:28]([NH:27][CH2:25][CH3:26])=[O:29])[CH:7]=[CH:6][CH:5]=1)#[N:20]

Participants

Conditions

Temperature: 100 °C

Procedure

2-(3-Aminophenylethynyl)-1-ethyl-6-methoxy-1H-indole-3-carbonitrile (100 mg, 0.32 mmol), prepared as described in Example 1H, is dissolved in pyridine (670 μL). Ethyl isocyanate (62 μL, 0.75 mmol) is added. The reaction mixture is then heated at 100° C. for 2 h. The mixture is then diluted in EtOAc, and is washed with aqueous HCl, followed by brine. The organic layer is dried and concentrated. Purification by silica chromatography (4/1, CH2Cl2/EtOAc), followed by trituration with hexanes/acetone (1/1), yields 1-[3-(3-cyano-1-ethyl-6-methoxy-1H-indol-2-ylethynyl)-phenyl]-3-ethyl urea (44 mg, 36%) as a white solid.

Workup

washis washed with aqueous HCl
customThe organic layer is dried
concentrationconcentrated
customPurification by silica chromatography (4/1, CH2Cl2/EtOAc)

Sources & evidence

ORD record: ord-a1a97655076c4545ad8d3ecb884dff63
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07781478B2

Reaction notes

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