Cesium carbonate → 4-{4-[7-(2,6-Dichloro-phenyl)-5-methyl-benzo[1,2,4]triazin-3-ylamino]-benzenesulfonyl}-piperazine-1-carboxylic acid tert-butyl ester

HRID 449227Notes

Reaction equation

HRID 449227 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[C:9]1[CH:19]=[C:18]([CH3:20])[C:12]2[N:13]=[C:14]([NH2:17])[N:15]=[N:16][C:11]=2[CH:10]=1.[C:21]([O:25][C:26]([N:28]1[CH2:33][CH2:32][N:31]([S:34]([C:37]2[CH:42]=[CH:41][C:40](Br)=[CH:39][CH:38]=2)(=[O:36])=[O:35])[CH2:30][CH2:29]1)=[O:27])([CH3:24])([CH3:23])[CH3:22].C(=O)([O-])[O-].[Cs+].[Cs+].C1(P(C2C=CC=CC=2)C2C3OC4C(=CC=CC=4P(C4C=CC=CC=4)C4C=CC=CC=4)C(C)(C)C=3C=CC=2)C=CC=CC=1>[Pd].[Pd].C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1>[C:21]([O:25][C:26]([N:28]1[CH2:33][CH2:32][N:31]([S:34]([C:37]2[CH:42]=[CH:41][C:40]([NH:17][C:14]3[N:15]=[N:16][C:11]4[CH:10]=[C:9]([C:3]5[C:4]([Cl:8])=[CH:5][CH:6]=[CH:7][C:2]=5[Cl:1])[CH:19]=[C:18]([CH3:20])[C:12]=4[N:13]=3)=[CH:39][CH:38]=2)(=[O:36])=[O:35])[CH2:30][CH2:29]1)=[O:27])([CH3:24])([CH3:22])[CH3:23]

Participants

6

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 166655764-(4-BOC-piperazinosulfonyl)bromobenzeneHCID 248227577-(2,6-Dichlorophenyl)-5-methylbenzo[e][1,2,4]triazin-3-amine

Product 1

HCID 116502904-{4-[7-(2,6-Dichloro-phenyl)-5-methyl-benzo[1,2,4]triazin-3-ylamino]-benzenesulfonyl}-piperazine-1-carboxylic acid tert-butyl esterYield 44%

Reagents, catalysts & solvents 1

HCID 9832798Tris(dibenzylideneacetone) dipalladiumCatalyst

Procedure

In a dry 25 mL round bottom flask, 7-(2,6-dichloro-phenyl)-5-methyl-benzo[1,2,4]triazin-3-ylamine (0.205 g, 0.672 mmol, 1 equiv), 4-(4-bromo-benzenesulfonyl)-piperazine-1-carboxylic acid tert-butyl ester (0.408 g, 1.01 mmol, 1.5 equiv), cesium carbonate (0.657 g, 2.02 mmol, 3 equiv); 4,5-bis(diphenylphosphino)-9,9-dimethyl xanthene (0.078 g, 0.134 mmol, 0.2 equiv) and tris(dibenzylideneacetone) dipalladium (0.0615 g, 0.067 mmol, 0.1 equiv) were combined. The reactants were flushed with argon, diluted with dioxane (20 mL) and outfitted with a reflux condenser. The reaction was heated to reflux for 2 hours, then filtered hot, and the solvents were evaporated. Purification on silica gel flash column provided desired product as a yellow solid (0.185 g, 44% yield). MS (ESI+): m/z=529.0 (M−100), LC retention time: 3.51 min. 1H NMR (DMSO-d6): δ 1.33 (s, 9H), 2.72 (s, 3H), 2.87 (m, 4H), 3.4 (m, 7.5 (m, 1H), 7.67 (d, J=8.7 Hz, 2H), 7.78 (m, 3H), 8.18 (d, J=1.7 Hz, 1H), 8.30 (d, J=8.8 Hz, 2H), 11.53 (s, 1H).

Workup

  1. customThe reactants were flushed with argon
  2. additiondiluted with dioxane (20 mL)
  3. customoutfitted with a reflux condenser
  4. temperatureThe reaction was heated
  5. temperatureto reflux for 2 hours
  6. filtrationfiltered hot
  7. customthe solvents were evaporated
  8. customPurification on silica gel flash column

Sources & evidence

ORD record
ord-64f5b48595e5490bae2480a459810db1
Source dataset
uspto-grants-2013_07
Patent number
US08481536B2

Reaction notes

Loading…