HCID 12194348, Verbindung → HCID 70269233, Verbindung

A flask was charged with (1R,2R,4R)-ethyl 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylate (3.91 g, 23.25 mmol) and ethanol (35 mL). The solution was degassed with nitrogen for 5 minutes, then palladium on carbon (5 wt. % wet) (1.0 g, 0.470 mmol) was added portionwise. The flask was evacuated and backfilled three times with nitrogen, then evacuated and backfilled with hydrogen (balloon). The reaction was stirred overnight at room temperature. The reaction was filtered through a plug of Celite and washed several times with ethanol, making sure to keep the catalyst wet with solvent (a layer of sand was added after the first wash). The filtrate was concentrated to afford (1R,2R,4S)-ethyl 7-oxabicyclo[2.2.1]heptane-2-carboxylate (3.63 g, 21.33 mmol, 92% yield). 1H NMR (400 MHz, CHLOROFORM-d) S=4.82 (d, J=5.0 Hz, 1H), 4.72 (t, J=5.0 Hz, 1H), 4.66 (t, J=5.0 Hz, 1H), 4.63-4.59 (m, 1H), 4.22-4.10 (m, 3H), 3.08-2.97 (m, 1H), 2.59 (dd, J=4.9, 9.1 Hz, 1H), 2.14 (dtd, J=2.6, 5.0, 12.3 Hz, 1H), 1.95-1.87 (m, 1H), 1.83-1.63 (m, 4H), 1.62-1.41 (m, 3H), 1.34-1.21 (m, 4H)

1. customThe solution was degassed with nitrogen for 5 minutes
2. customThe flask was evacuated
3. customevacuated
4. filtrationThe reaction was filtered through a plug of Celite
5. washwashed several times with ethanol
6. additionwas added after the
7. washfirst wash)
8. concentrationThe filtrate was concentrated

ORD-Eintrag

ord-f871a53b3d654a0e8ab1e68741f700bd

Quelldatensatz

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09212182B2