Water → 4-Chloro-1-(toluene-4-sulfonyl)-2-tributylstannanyl-1H-pyrrolo[2,3-b]pyridine

HRID 506779Notes

Reaction equation

[Li+].CC([N-]C(C)C)C.[Cl:9][C:10]1[CH:15]=[CH:14][N:13]=[C:12]2[N:16]([S:19]([C:22]3[CH:27]=[CH:26][C:25]([CH3:28])=[CH:24][CH:23]=3)(=[O:21])=[O:20])[CH:17]=[CH:18][C:11]=12.[Sn:29](Cl)([CH2:38][CH2:39][CH2:40][CH3:41])([CH2:34][CH2:35][CH2:36][CH3:37])[CH2:30][CH2:31][CH2:32][CH3:33].O>C1COCC1.CCOC(C)=O>[Cl:9][C:10]1[CH:15]=[CH:14][N:13]=[C:12]2[N:16]([S:19]([C:22]3[CH:27]=[CH:26][C:25]([CH3:28])=[CH:24][CH:23]=3)(=[O:21])=[O:20])[C:17]([Sn:29]([CH2:34][CH2:35][CH2:36][CH3:37])([CH2:38][CH2:39][CH2:40][CH3:41])[CH2:30][CH2:31][CH2:32][CH3:33])=[CH:18][C:11]=12

Participants

Conditions

Temperature: -78 °C

Procedure

Add LDA (1.5 equiv., 0.74 mL, 1.47 mmol) dropwise in the space of 5 min to azaindole 25 (0.3 g, 0.98 mmol) in THF (15 mL), stirred at −78° C., under N2. After stirring the reaction medium for 0.5 h, add Bu3SnCl dropwise (475 mg, 400 μL, 1.47 mmol) and stir the reaction medium for a further 0.5 h. Then allow the reaction medium to return to room temperature, stop the reaction with H2O, dilute with EtOAc (200 mL), wash with brine, dry (MgSO4) and concentrate. The residue is submitted to flash chromatography to give 26 (0.46 g, 79%) as a colorless oil: 1H NMR (CDCl3) δ 8.15 (d, 1H, J=5.1 Hz), 7.97 (dd, 2H, J=8.0, 1.5 Hz), 7.27 (d, 2H, J=8.4 Hz), 7.09 (d, 1H, J=5.2 Hz), 6.75 (s, 1H), 2.36 (s, 3H), 1.65-1.20 (m, 12H), 0.93 (t, 9H), TLC (EtOAc at 40%/heptane) Rf=0.65.

Workup

stirringAfter stirring the reaction medium for 0.5 h
stirringstir the reaction medium for a further 0.5 h
customto return to room temperature
washwash with brine
dry with materialdry (MgSO4)
concentrationconcentrate

Sources & evidence

ORD record: ord-4b647f6a64d8407f8fc0b084d1c5fb66
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07786114B2

Reaction notes

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