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Diisopropylethylamine → 4-Methyl-3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-N-(thiadiazol-2-yl)-benzamide

HRID 889328
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 889328
[CH3:1][C:2]1[CH:10]=[CH:9][C:5]([C:6](O)=[O:7])=[CH:4][C:3]=1[B:11]1[O:15][C:14]([CH3:17])([CH3:16])[C:13]([CH3:19])([CH3:18])[O:12]1.CCN(C(C)C)C(C)C.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.[NH2:53][N:54]1[NH:58][CH:57]=[CH:56][S:55]1>CN(C=O)C>[CH3:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([NH:53][N:54]2[NH:58][CH:57]=[CH:56][S:55]2)=[O:7])=[CH:4][C:3]=1[B:11]1[O:12][C:13]([CH3:19])([CH3:18])[C:14]([CH3:17])([CH3:16])[O:15]1
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Komponenten

6

Edukt 4

HCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 160860864-Methyl-3-(tetramethyl-1,3,2-dioxaborolan-2-yl)benzoic acidHCID 219145783H-thiadiazol-2-amine

Produkt 1

HCID 21914652
4-Methyl-3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-N-(thiadiazol-2-yl)-benzamide

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

4-Methyl-3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzoic acid (2.0 g, 7.63 mmol), DIPEA (4 ml, 22.89 mmol) and HATU (3.05 g, 8.02 mmol) were dissolved in DMF (20 ml) and stirred at room temperature for 15 mins. 2-Aminothiadiazole (810 mg, 8.01 mmol) was added and the reaction stirred at room temperature for 18 hours. The solvent was evaporated under vacuum and the reaction partitioned between ethyl acetate (250 ml) and hydrochloric acid (2N, 150 ml). The aqueous was extracted with ethylacetate (2×250 ml). The combined organic extracts were dried (magnesium sulphate) and the solvent evaporated under vacuum. The residue was absorbed onto silica and purified by flash column chromatography eluting with cyclohexane/ethyl acetate (4:1 then 1:1). The solvent was evaporated from the product fractions under vacuum to 4-methyl-3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-N-(thiadiazol-2-yl)-benzamide (0.95 g). LCMS: retention time 3.34 min, MH− 346. NMR: δH [2H6]-DMSO 13.08,(1H, b), 9.22,(1H, s), 8.35,(1H, d), 8.11,(1H, dd), 7.38,(1H, d), 2.55,(3H, s), 1.34,(12H, s).

Aufarbeitung

  1. stirringthe reaction stirred at room temperature for 18 hours
  2. customThe solvent was evaporated under vacuum
  3. customthe reaction partitioned between ethyl acetate (250 ml) and hydrochloric acid (2N, 150 ml)
  4. extractionThe aqueous was extracted with ethylacetate (2×250 ml)
  5. dry with materialThe combined organic extracts were dried (magnesium sulphate)
  6. customthe solvent evaporated under vacuum
  7. customThe residue was absorbed onto silica
  8. custompurified by flash column chromatography
  9. washeluting with cyclohexane/ethyl acetate (4:1
  10. customThe solvent was evaporated from the product fractions under vacuum to 4-methyl-3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-N-(thiadiazol-2-yl)-benzamide (0.95 g)

Quellen und Nachweise

ORD-Eintrag
ord-3776c48b13df45f88a72f3a14d7adff0
Quelldatensatz
uspto-grants-2012_08
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08252818B2

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