1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 2-Phenylbenzo[d]oxazole-4-carboxamide

HRID 415235Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 415235
[C:1]1([C:7]2[O:8][C:9]3[C:10](=[C:12]([C:16]([OH:18])=O)[CH:13]=[CH:14][CH:15]=3)[N:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C1C=CC2N(O)N=[N:25]C=2C=1.[NH4+].[Cl-].CCN(C(C)C)C(C)C.CCN=C=NCCCN(C)C>CN(C=O)C.O>[C:1]1([C:7]2[O:8][C:9]3[C:10](=[C:12]([C:16]([NH2:25])=[O:18])[CH:13]=[CH:14][CH:15]=3)[N:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Komponenten

8

Edukt 5

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 25517Ammonium ChlorideHCID 757711-HydroxybenzotriazoleHCID 81531DiisopropylethylamineHCID 108683692-Phenylbenzoxazole-4-carboxylic acid

Produkt 1

HCID 117763402-Phenylbenzo[d]oxazole-4-carboxamide

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterLösungsmittelHCID 6228DimethylformamideLösungsmittel

Reaktionsbedingungen

Temperatur
25 °C

Versuchsvorschrift

To a solution of 2-phenylbenzo[d]oxazole-4-carboxylic acid in DMF (15 mL) was added HOBt (148 mg, 1.1 mmol), NH4Cl (54 mg, 1.0 mmol), DIPEA (387 mg, 3.0 mmol) and EDCI (211 mg, 1.1 mmol). The mixture was stirred at 25° C. for 10 hr. Then water (10 mL) was added and aqueous hydrochloric acid (1 N) to pH=3 and extracted with ethyl acetate (100 mL×4). The organic phase was washed with saturated sodium bicarbonate solution and brine, concentrated and dried in vacuum. The crude product was purified by pre-HPLC to obtain 2-phenylbenzo[d]oxazole-4-carboxamide as a white solid (40 mg). 1H-NMR (400 MHz, DMSO-d6) δ 7.47-7.56 (m, 1H), 7.63-7.68 (m, 3H), 7.93-8.01 (m, 3H), 8.28-8.30 (d, J=8 Hz, 2H), 8.47 (s, 1H); LC-MS (ESI) m/z 239 [M+1]+.

Aufarbeitung

  1. extractionaqueous hydrochloric acid (1 N) to pH=3 and extracted with ethyl acetate (100 mL×4)
  2. washThe organic phase was washed with saturated sodium bicarbonate solution and brine
  3. concentrationconcentrated
  4. customdried in vacuum
  5. customThe crude product was purified by pre-HPLC

Quellen und Nachweise

ORD-Eintrag
ord-735ab54c650c4917a9642fd196d03bc4
Quelldatensatz
uspto-grants-2012_01
Patentnummer
US08088760B2

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