Imidazole → HCID 23525647, Verbindung

HRID 2415555Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2415555
[N:1](C(OCC)=O)=[N:2]C(OCC)=O.[Cl:13][C:14]1[CH:19]=[CH:18][C:17]([C:20]2[CH2:21][CH2:22][N:23]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:24][CH:25]=2)=[C:16]([C@H:33](O)[CH3:34])[CH:15]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[NH:55]1C=CN=C1>ClCCl.[Zn](N=[N+]=[N-])N=[N+]=[N-]>[Cl:13][C:14]1[CH:19]=[CH:18][C:17]([C:20]2[CH2:21][CH2:22][N:23]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:24][CH:25]=2)=[C:16]([C@@H:33]([N:55]=[N+:1]=[N-:2])[CH3:34])[CH:15]=1

Komponenten

7

Edukt 4

HCID 795ImidazoleHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 68519018Tert-Butyl 4-{4-Chloro-2-[(1R)-1-Hydroxyethyl]Phenyl}-3,6-Dihydropyridine-1(2H)-Carboxylate

Produkt 1

HCID 23525647HCID 23525647, VerbindungAusbeute 83,5 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 178514646Zinc azideKatalysatorHCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A solution of diethyl azodicarboxylate (49.6 mL, 0.315 mol) was added dropwise to a stirred mixture of tert-butyl 4-{4-chloro-2-[(1R)-1-hydroxyethyl]phenyl}-3,6-dihydropyridine-1(2H)-carboxylate (3-5) (26.7 g, 78.9 mmol), Zn(N3)2.2Py (prepared according to the method described by Viaud, M-C; Rollin, P. in Synthesis, 1990: 130-131) (48.5 g, 0.158 mol), triphenylphosphine (82.7 g, 0.315 mol) and imidazole (21.5 g, 0.315 mol) in dichloromethane at approximately 0° C. After the addition, the resulting mixture was allowed to warm to ambient temperature and stirred vigorously for 3 d. The reaction mixture was filtered through a short column of silica gel eluted with the appropriate volume of dichloromethane to remove excess salts and polar byproducts. The filtrate was concentrated in vacuo and the crude residue was purified by flash chromatography on silica gel (12.5% ethyl acetate/hexanes as eluent) to furnish 3-6 (23.9 g) as a viscous pale yellow oil.

Aufarbeitung

  1. custom2Py (prepared
  2. additionAfter the addition
  3. filtrationThe reaction mixture was filtered through a short column of silica gel
  4. washeluted with the appropriate volume of dichloromethane
  5. customto remove excess salts and polar byproducts
  6. concentrationThe filtrate was concentrated in vacuo
  7. customthe crude residue was purified by flash chromatography on silica gel (12.5% ethyl acetate/hexanes as eluent)

Quellen und Nachweise

ORD-Eintrag
ord-e74c60020ad44bb6ac00d358502ab5e9
Quelldatensatz
uspto-grants-2004_11
Patentnummer
US06818658B2

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