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Hexane → trans-N-(4'-chlorophenyl)-2,2-diethoxy-3,6-dimethyl-4-ethoxy-3,4-dihydro-2H-pyran-5-carboxamide

HRID 466276
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 466276
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9](=[O:18])[C:10](=[CH:14][O:15][CH2:16][CH3:17])[C:11](=[O:13])[CH3:12])=[CH:4][CH:3]=1.[CH2:19]([O:21][C:22]([O:25][CH2:26][CH3:27])=[CH:23][CH3:24])[CH3:20].CCCCCC>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([NH:8][C:9]([C:10]2[C@@H:14]([O:15][CH2:16][CH3:17])[C@H:23]([CH3:24])[C:22]([O:25][CH2:26][CH3:27])([O:21][CH2:19][CH3:20])[O:13][C:11]=2[CH3:12])=[O:18])=[CH:6][CH:7]=1
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Komponenten

5

Edukt 3

HCID 8058HexaneHCID 1408411-Propene, 1,1-diethoxy-HCID 54471103N-(4'-Chlorophenyl)-2-ethoxymethylene-3-oxobutanamide

Produkt 1

HCID 86746200trans-N-(4'-chlorophenyl)-2,2-diethoxy-3,6-dimethyl-4-ethoxy-3,4-dihydro-2H-pyran-5-carboxamide

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel

Versuchsvorschrift

N-(4'-Chlorophenyl)-2-ethoxymethylene-3-oxo-butanamide (1.3 g) and tris (6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedianato)ytterbium (0.26 g) were stirred in toluene (10 ml) whilst 1,1-diethoxyprop-1-ene (2 g) was added dropwise. The mixture was stirred at room temperature for two hours and evaporated to dryness. The residual gum was purified by medium pressure liquid chromatography on K60 silica using ethyl acetate/petroleum ether b.p. 60°-80° C., 15/85 v/v as eluting solvent to give two stereoisomers. The first isomer after trituration with n-hexane gave trans-N-(4'-chlorophenyl)-2,2-diethoxy-3,6-dimethyl-4-ethoxy-3,4-dihydro-2H-pyran-5-carboxamide (0.2 ), m.p. 104°-106° C. The second isomer, again after trituration with n-hexane, gave cis-N-(4'-chlorophenyl)-2,2-diethoxy-3,6-dimethyl-4-ethoxy-3,4-dihydro-2H-pyran-5-carboxamide (1.3 g), m.p. 125°-127° C.

Aufarbeitung

  1. additionwas added dropwise
  2. customevaporated to dryness
  3. customThe residual gum was purified by medium pressure liquid chromatography on K60 silica
  4. washas eluting solvent
  5. customto give two stereoisomers

Quellen und Nachweise

ORD-Eintrag
ord-f107c7bd42314ff3abab83489b4e81c0
Quelldatensatz
uspto-grants-1992_10
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05155236

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