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Potassium Carbonate → tert-butyl 3-(1H-indol-5-yl)-1,2,4-thiadiazol-5-ylcarbamate

HRID 634260
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 634260
Br[C:2]1[N:6]=[C:5]([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11])[S:4][N:3]=1.[NH:15]1[C:23]2[C:18](=[CH:19][C:20](B(O)O)=[CH:21][CH:22]=2)[CH:17]=[CH:16]1.C([O-])([O-])=O.[K+].[K+]>O1CCOCC1.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>[NH:15]1[C:23]2[C:18](=[CH:19][C:20]([C:2]3[N:6]=[C:5]([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11])[S:4][N:3]=3)=[CH:21][CH:22]=2)[CH:17]=[CH:16]1
KomponentenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 3

HCID 11430Potassium CarbonateHCID 27343615-Indolylboronic acidHCID 44604453tert-Butyl (3-bromo-1,2,4-thiadiazol-5-yl)carbamate

Produkt 1

HCID 68356726tert-butyl 3-(1H-indol-5-yl)-1,2,4-thiadiazol-5-ylcarbamateAusbeute 44,2 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 178418397
HCID 178418397, Verbindung
Katalysator
HCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

To a mixture of tert-butyl (3-bromo-1,2,4-thiadiazol-5-yl)carbamate (100 mg, 0.359 mmol) and indole-5-boronic acid (57.9 mg, 0.359 mmol) in 1,4-dioxane (5 mL) was added Pd(PPh3)4 (20.77 mg, 0.017 mmol) and 1M aq K2CO3 solution (0.539 mL, 0.539 mmol). N2 gas was purged for 15 min. After 15 min, the reaction was heated at reflux for 4 h. The reaction mixture was cooled to RT and treated with H2O (5 mL), extracted with EtOAc (25 mL). The aqueous layer was back extracted with EtOAc (25 mL). The combined organic layers were dried over anhydrous Na2SO4 and concentrated. The crude was further purified by silica gel column chromatography (eluent: 10% EtOAc in petroleum ether) to afford tert-butyl (3-(1H-indol-5-yl)-1,2,4-thiadiazol-5-yl)carbamate (50 mg, 44.2%) as an off white solid. MS (ESI, pos. ion) m/z: 261 (M+1); 1H NMR (400 MHz, DMSO-d6): δ 12.40 (s, 1H), 11.31 (s, 1H), 8.35 (s, 1H), 7.91 (dd, J=1.2 Hz & 8.4 Hz, 1H), 7.46 (d, J=8.4 Hz, 1H), 7.41-7.40 (m, 1H), 6.35 (s, 1H), 1.52 (s, 9H).

Aufarbeitung

  1. customN2 gas was purged for 15 min
  2. temperaturethe reaction was heated
  3. temperatureat reflux for 4 h
  4. additiontreated with H2O (5 mL)
  5. extractionextracted with EtOAc (25 mL)
  6. extractionThe aqueous layer was back extracted with EtOAc (25 mL)
  7. dry with materialThe combined organic layers were dried over anhydrous Na2SO4
  8. concentrationconcentrated
  9. customThe crude was further purified by silica gel column chromatography (eluent: 10% EtOAc in petroleum ether)

Quellen und Nachweise

ORD-Eintrag
ord-4930042288cf4bf7aed8ce4f4f2fb1e9
Quelldatensatz
uspto-grants-2016_04
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US09321756B2

Notizen zur Reaktion

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