N-isopropyl-6-(tributylstannyl)pyrazin-2-amine → 5-(3-(6-(isopropylamino)pyrazin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine

HRID 634257Notes

Reaction equation

HRID 634257 reaction equation
I[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([C:11]3[S:15][N:14]=[C:13]([NH:16][CH2:17][C:18]4[CH:23]=[CH:22][C:21]([O:24][CH3:25])=[CH:20][CH:19]=4)[N:12]=3)[CH:9]=2)[N:4]([S:26]([C:29]2[CH:35]=[CH:34][C:32]([CH3:33])=[CH:31][CH:30]=2)(=[O:28])=[O:27])[CH:3]=1.[CH:36]([NH:39][C:40]1[CH:45]=[N:44][CH:43]=[C:42]([Sn](CCCC)(CCCC)CCCC)[N:41]=1)([CH3:38])[CH3:37]>CN(C=O)C.[Cu]I.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>[CH:36]([NH:39][C:40]1[N:41]=[C:42]([C:2]2[C:10]3[C:5](=[CH:6][CH:7]=[C:8]([C:11]4[S:15][N:14]=[C:13]([NH:16][CH2:17][C:18]5[CH:23]=[CH:22][C:21]([O:24][CH3:25])=[CH:20][CH:19]=5)[N:12]=4)[CH:9]=3)[N:4]([S:26]([C:29]3[CH:30]=[CH:31][C:32]([CH3:33])=[CH:34][CH:35]=3)(=[O:27])=[O:28])[CH:3]=2)[CH:43]=[N:44][CH:45]=1)([CH3:38])[CH3:37]

Participants

6

Reactant 2

HCID 68328197N-isopropyl-6-(tributylstannyl)pyrazin-2-amineHCID 683287145-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine

Product 1

HCID 683286605-(3-(6-(isopropylamino)pyrazin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amineYield 63.5%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
90 °C

Procedure

A solution of 5-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine (0.78 g, 1.26 mmol) and N-isopropyl-6-(tributylstannyl)pyrazin-2-amine ((0.65 g, 1.52 mmol) in DMF (8 mL) was purged with argon for 15 min. To the above mixture, CuI (0.289 g, 1.52 mmol) and Pd(PPh3)4 (0.146 g, 0.126 mmol) was added and argon gas was purged for another 15 min. The reaction was heated at 90° C. for 1 h, then cooled to RT. The mixture was treated with ice cold H2O to obtain off brown precipitate. The precipitate was filtered and washed with H2O and dried. The crude was purified by neutral alumina column chromatography (eluent: 20% EtOAc in petroleum ether) to give 5-(3-(6-(isopropylamino)pyrazin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine (0.5 g, 63.5%) as an off brown solid. MS (ESI, pos. ion) m/z: 626.2 (M+1); 1H-NMR (300 MHz, DMSO-d6): δ 9.02 (brs, 1H), 8.70 (s, 1H), 8.18-8.16 (m, 1H), 7.99 (m, 2H), 7.65-7.75 (m, 3H), 7.44-7.40 (m, 3H), 7.30-7.28 (m, 2H), 1.70-7.68 (m, 1H), 6.88 (m, 1H), 4.42 (m, 2H), 3.71 (s, 3H), 2.31 (s, 3H), 1.56 (m, 6H).

Workup

  1. customargon gas was purged for another 15 min
  2. temperaturecooled to RT
  3. additionThe mixture was treated with ice cold H2O
  4. customto obtain off brown precipitate
  5. filtrationThe precipitate was filtered
  6. washwashed with H2O
  7. customdried
  8. customThe crude was purified by neutral alumina column chromatography (eluent: 20% EtOAc in petroleum ether)

Sources & evidence

ORD record
ord-3363c8dc7ff94e61a675bc99461074e1
Source dataset
uspto-grants-2016_04
Patent number
US09321756B2

Reaction notes

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