Diethyl cyclopropane-1,1-dicarboxylate → Ethyl 1-(hydroxymethyl)cyclopropane-1-carboxylate

HRID 1802423Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1802423
[Li+].CC(O[Al-](OC(C)(C)C)OC(C)(C)C)(C)C.[C:18]1([C:26](OCC)=[O:27])([C:21]([O:23][CH2:24][CH3:25])=[O:22])[CH2:20][CH2:19]1>C1COCC1.C(Cl)Cl>[CH2:24]([O:23][C:21]([C:18]1([CH2:26][OH:27])[CH2:20][CH2:19]1)=[O:22])[CH3:25]

Komponenten

5

Edukt 2

HCID 73790Diethyl cyclopropane-1,1-dicarboxylateHCID 16688073Lithium aluminum-tri-tert-butoxyhydride2×

Produkt 1

HCID 12450336Ethyl 1-(hydroxymethyl)cyclopropane-1-carboxylateAusbeute 97,4 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6344DichloromethaneLösungsmittelHCID 8028TetrahydrofuranLösungsmittel3×

Versuchsvorschrift

A solution of lithium aluminum-tri-tert-butoxyhydride 1.0M in THF (28.5 mL, 28.5 mmol) is added to a solution of diethyl 1,1-cyclopropanedicarboxylate (2.0 mL, 11.4 mmol) in anhydrous THF (85.0 mL). After stirring the reaction mixture for 4 h, 10 mL of lithium aluminum-tri-tert-butoxyhydride 1.0M solution in THF is added and the solution is stirred overnight. The reaction mixture is diluted with DCM, washed with 1N HCl, saturated NaHCO3 solution and brine. After drying the organic phase over anhydrous Na2SO4, removal of the solvent under reduced pressure affords 1.60 g of 1-hydroxymethyl-cyclopropanecarboxylic acid ethyl ester that is used in the next step without further purification. Yield: 85%. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 0.88 (2H, q, J=4.1 Hz), 1.21-1.33 (5H, m), 2.59 (1H, t, J=6.9 Hz), 3.63 (2H, d, J=7.2 Hz), 4.17 (2H, q, J=7.1 Hz).

Aufarbeitung

  1. stirringthe solution is stirred overnight
  2. washwashed with 1N HCl, saturated NaHCO3 solution and brine
  3. customAfter drying the organic phase
  4. customover anhydrous Na2SO4, removal of the solvent under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-558f090b763b4ac68df4ea09dcaca720
Quelldatensatz
uspto-grants-2013_01
Patentnummer
US08349871B2

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