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 for 18 h. The reaction mixture is diluted with DCM, washed with 1N aqueous HCl solution, saturated aqueous 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 for 18 h
2. washwashed with 1N aqueous HCl solution, saturated aqueous NaHCO3 solution and brine
3. customAfter drying the organic phase
4. customover anhydrous Na2SO4, removal of the solvent under reduced pressure

ORD-Eintrag

ord-94052ad926a544599a6d4578b1b3906b

Quelldatensatz

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08372874B2