Allyltributylstannane → 2-(3-allyl-6-chloropyridin-2-yl)-4-fluoro-1H-indole

HRID 595713Notes

Reaction equation

FC(F)(F)S(O[C:7]1[C:8]([C:14]2[NH:15][C:16]3[C:21]([CH:22]=2)=[C:20]([F:23])[CH:19]=[CH:18][CH:17]=3)=[N:9][C:10]([Cl:13])=[CH:11][CH:12]=1)(=O)=O.[CH2:26]([Sn](CCCC)(CCCC)CCCC)[CH:27]=[CH2:28].[Li+].[Cl-]>C1COCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:28]([C:7]1[C:8]([C:14]2[NH:15][C:16]3[C:21]([CH:22]=2)=[C:20]([F:23])[CH:19]=[CH:18][CH:17]=3)=[N:9][C:10]([Cl:13])=[CH:11][CH:12]=1)[CH:27]=[CH2:26]

Participants

Conditions

Temperature: 60 °C

Procedure

To a mixture of 6-chloro-2-(4-fluoro-1H-indol-2-yl)pyridin-3-yl trifluoromethanesulfonate (2 g, 5.1 mmol), allyltributylstannane (2 g, 6.1 mmol) and anhydrous LiCl (256 mg, 6.1 mmol) in THF (30 mL), Pd(PPh3)4 (588 mg, 0.51 mmol) was added under N2 protection. The reaction mixture was stirred at 60° C. overnight. After it was concentrated in vacuo, the residue was purified by column chromatography (PE:EA=400:1˜100:1) to give the product of 2-(3-allyl-6-chloropyridin-2-yl)-4-fluoro-1H-indole (1 g, yield: 68%). 1H-NMR (CDCl3, 400 MHz) δ 9.72 (s, 1H), 7.57 (d, J=8.0 Hz, 1H), 7.12˜7.24 (m, 3H), 7.02 (s, 1H), 6.77 (t, J=8.0 Hz, 1H), 6.04˜6.12 (m, 1H), 5.25 (d, J=10.0 Hz, 1H), 5.13 (d, J=17.2 Hz, 1H), 3.74 (d, J=6.0 Hz, 2H). MS (M+H)+: 287/289.

Workup

additionwas added under N2 protection
concentrationAfter it was concentrated in vacuo
customthe residue was purified by column chromatography (PE:EA=400:1˜100:1)

Sources & evidence

ORD record: ord-e417a7062404406d8dfaeaf6d78ba335
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09243002B2

Reaction notes

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