Sodium borohydride → 6,7-Dihydro-5H-cyclopenta[b]pyridin-5-amine

Temperatur

-40 °C

To a solution of (5Z)-6,7-dihydro-5H-cyclopenta[b]pyridin-5-one oxime (320 mg) in methanol (20 ml) under N2 was added nickel chloride hexahydrate. The reaction mixture was cooled to −40° C. and sodium borohydride (817 mg) was slowly added over 30 min. The reaction mixture was warmed to ambient temperature for 1 h and silica gel was added. The reaction mixture was concentrated. MPLC chromatography was run using a biotage 25S column with 5–8% methanol/methylene chloride with 0.5% ammonium hydroxide to provide the title compound as an oil (197 mg, 68%): 1H NMR (400 MHz, CDCl3) δ 8.43, 7.66, 7.28, 7.15, 4.42, 3.13–3.00, 2.97–2.91, 2.63–2.55, 1.81–1.72.

1. temperatureThe reaction mixture was warmed to ambient temperature for 1 h
2. additionsilica gel was added
3. concentrationThe reaction mixture was concentrated

ORD-Eintrag

ord-34beb2c54ce94473b957a2e7b9b4151c

Quelldatensatz

uspto-grants-2006_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07041672B2