Triethylamine → (4S-trans)-4,5-dihydro-5-[4-(methylsulfonyl)phenyl]-2-phenyl-4-oxazolecarboxylic acid ethyl ester

HRID 1879335Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1879335
[CH2:1]([O:3][C:4](=[O:19])[C@@H:5]([NH2:18])[C@@H:6]([C:8]1[CH:13]=[CH:12][C:11]([S:14]([CH3:17])(=[O:16])=[O:15])=[CH:10][CH:9]=1)[OH:7])[CH3:2].Cl.C(O[C:24]([C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)=N)C.C(N(CC)CC)C>O>[CH2:1]([O:3][C:4]([C@@H:5]1[C@@H:6]([C:8]2[CH:13]=[CH:12][C:11]([S:14]([CH3:17])(=[O:16])=[O:15])=[CH:10][CH:9]=2)[O:7][C:24]([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)=[N:18]1)=[O:19])[CH3:2]

Komponenten

5

Edukt 3

HCID 8471TriethylamineHCID 79249Benzenecarboximidic acid, ethyl ester, hydrochloride (1:1)2×HCID 34175685(2S,3R)-Ethyl-2-amino-3-[4-(methylsulfonyl)phenyl]-3-hydroxy-propanoate

Produkt 1

HCID 46831018(4S-trans)-4,5-dihydro-5-[4-(methylsulfonyl)phenyl]-2-phenyl-4-oxazolecarboxylic acid ethyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

(2S,3R)-Ethyl-2-amino-3-[4-(methylsulfonyl)phenyl]-3-hydroxy-propanoate (Compound VIc) (10 g, 0.0348 moles) is reacted at about 0° C. in a reaction vessel with benzenecarboximidic acid ethyl ester hydrochloride (Compound IV hydrochloride salt wherein R2 is phenyl and R4 is ethyl) (about 7.1 g, 0.03828 moles) in 1,2-dichloromethane (about 650 mL) containing triethylamine (3.9 g, 0.03828 moles). Thereafter, water is added (about 500 mL). Next, the organic layer is separated and washed with dilute hydrochloric acid (about 1 N) and dilute sodium bicarbonate (about 1N). The washed organic layer is dried over anhydrous sodium sulfate. The dried organic layer is heated to evaporate the 1,2-dichloromethane to yield (4S-trans)-4,5-dihydro-5-[4-(methylsulfonyl)phenyl]-2-phenyl-4-oxazolecarboxylic acid ethyl ester (Compound IIIk).

Aufarbeitung

  1. customNext, the organic layer is separated
  2. washwashed with dilute hydrochloric acid (about 1 N) and dilute sodium bicarbonate (about 1N)
  3. dry with materialThe washed organic layer is dried over anhydrous sodium sulfate
  4. temperatureThe dried organic layer is heated
  5. customto evaporate the 1,2-dichloromethane

Quellen und Nachweise

ORD-Eintrag
ord-87b323f4a71243a88c2d591df2389e02
Quelldatensatz
uspto-grants-2012_11
Patentnummer
US08314252B2

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