Reaktion #67539

Reaktionsgleichung

pyridine

67

Butyl 2-hydroxyethylcarbamate

→

aldehyde

Butyl formylmethylcarbamate

Lösungsmittel

CH2Cl2

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe mixture was stirred for 1 h at room temperature
2. 2
   FiltrationIt was filtered through a pad of silica gel (5 g)
3. 3
   Waschenrinsed through with 50 mL of ethyl acetate
4. 4
   EinengenThe filtrate was concentrated in vacuo

Vorschrift

A solution of pyridine (1.8 mL) in 28 mL of CH2Cl2 was cooled in an ice bath and chromium trioxide (1.12 g) was added in one portion. The mixture was stirred at the same temperature for 20 min and at room temperature for 1 h. A solution of 67 (300 mg) in 2 mL of CH2Cl2 was added in one portion and the mixture was stirred for 1 h at room temperature. It was filtered through a pad of silica gel (5 g) and rinsed through with 50 mL of ethyl acetate. The filtrate was concentrated in vacuo to give the crude aldehyde which was used without further purification. 1H NMR (400 MHz, CDCl3) δ 0.93 (t, J=7.4 Hz, 3H), 1.38 (sextet, J=7.4 Hz, 2H), 1.61 (pentet, J=7.1 Hz, 2H), 4.09 (t, J=6.7 Hz, 2H), 4.14 (d, J=5.0 Hz, 2H), 5.30 (broad s, 1H), 9.66 (s, 1H).

Quelle