Dimethylformamide → 5-(3-(6-chloropyrazin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,3,4-oxadiazol-2-amine

HRID 634098Notes

Reaction equation

HRID 634098 reaction equation
[Cl:1][C:2]1[CH:7]=[N:6][CH:5]=[C:4]([Sn](CCCC)(CCCC)CCCC)[N:3]=1.I[C:22]1[C:30]2[C:25](=[CH:26][CH:27]=[C:28]([C:31]3[O:35][C:34]([NH:36][CH2:37][C:38]4[CH:43]=[CH:42][C:41]([O:44][CH3:45])=[CH:40][CH:39]=4)=[N:33][N:32]=3)[CH:29]=2)[N:24]([S:46]([C:49]2[CH:55]=[CH:54][C:52]([CH3:53])=[CH:51][CH:50]=2)(=[O:48])=[O:47])[CH:23]=1.CN(C=O)C>C(Cl)Cl.[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>[Cl:1][C:2]1[N:3]=[C:4]([C:22]2[C:30]3[C:25](=[CH:26][CH:27]=[C:28]([C:31]4[O:35][C:34]([NH:36][CH2:37][C:38]5[CH:39]=[CH:40][C:41]([O:44][CH3:45])=[CH:42][CH:43]=5)=[N:33][N:32]=4)[CH:29]=3)[N:24]([S:46]([C:49]3[CH:50]=[CH:51][C:52]([CH3:53])=[CH:54][CH:55]=3)(=[O:48])=[O:47])[CH:23]=2)[CH:5]=[N:6][CH:7]=1

Participants

7

Reactant 3

HCID 6228DimethylformamideHCID 117740572-Chloro-6-(tributylstannyl)pyrazineHCID 683283255-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,3,4-oxadiazol-2-amine

Product 1

HCID 867250915-(3-(6-chloropyrazin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,3,4-oxadiazol-2-amineYield 49.1%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418397HCID 178418397, compoundCatalystHCID 6344DichloromethaneSolvent

Conditions

Temperature
100 °C

Procedure

In a 20 mL glass microwave tube, 2-chloro-6-(tributylstannyl)pyrazine (0.807 g, 1.999 mmol), 5-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,3,4-oxadiazol-2-amine (1.00 g, 1.665 mmol), CuI (0.381 g, 1.999 mmol), Pd(PPh3)4 (0.096 g, 0.083 mmol) was purged with argon and treated with DMF (15 mL). The tube was heated in an Initiator microwave reactor (Personal Chemistry, Biotage AB, Inc., Uppsala, Sweden) at 100° C. for 1 h. The crude mixture was then diluted with DCM and washed with water. The organic layer was dried, filtered and concentrated and the residue was purified with flash chromatography to give 5-(3-(6-chloropyrazin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,3,4-oxadiazol-2-amine (0.48 g, 0.818 mmol, 49%) as a light yellow amorphous solid. MS (ESI, pos. ion) m/z: 586.9 (M+1). 1H NMR (400 MHz, DMSO-d6) δ ppm 9.44 (1H, s), 9.02 (1H, s), 8.85 (1H, s), 8.71 (1H, s), 8.28-8.36 (1H, m), 8.18 (1H, d, J=8.8 Hz), 8.03 (1H, m, J=8.4 Hz), 7.95 (1H, s), 7.88-7.95 (1H, m), 7.45 (1H, m, J=8.2 Hz), 7.33 (2H, m, J=8.6 Hz), 6.90 (2H, m, J=8.6 Hz), 4.37 (2H, d, J=6.1 Hz), 3.72 (3H, s), 2.33 (3H, s).

Workup

  1. washwashed with water
  2. customThe organic layer was dried
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customthe residue was purified with flash chromatography

Sources & evidence

ORD record
ord-bd4327163f0848d29b01cf8b5ec01f9f
Source dataset
uspto-grants-2016_04
Patent number
US09321756B2

Reaction notes

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