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

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).

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

ORD-Eintrag

ord-746aa07d22cc4b5ead86c9039548f663

Quelldatensatz

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08048899B2