Reaktion #1525492

Reaktionsgleichung

triethylamine

Dimethyl sulfoxide

oxalyl chloride

2-(3-chloro-5-hydroxymethyl-pyridin-2-yl)-2-methyl-propionitrile

2-(3-Chloro-5-hydroxymethyl-pyridin-2-yl)-2-methyl-propionitrile

→

product

Ausbeute 62.0%

2-(3-Chloro-5-formyl-pyridin-2-yl)-2-methyl-propionitrile

Ausbeute 62.0%

Lösungsmittel

water

CH2Cl2

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeto reach room temperature
2. 2
   Extraktionextracted with EtOAc (2×50 mL)
3. 3
   WaschenThe combined organics were washed with brine
4. 4
   Trocknendried over Na2SO4
5. 5
   Filtrationfiltered
6. 6
   Einengenconcentrated
7. 7
   SonstigeThe residue was purified by flash column chromatography (0-20% EtOAc in hexanes)

Vorschrift

A solution of oxalyl chloride (0.45 mL, 5.21 mmol) and in dry CH2Cl2 (11 mL), was cooled to −50° C. Dimethyl sulfoxide (0.76 g, 10.87 mmol) was added drop wise at a rapid rate. After 5 minutes, 2-(3-chloro-5-hydroxymethyl-pyridin-2-yl)-2-methyl-propionitrile (0.95 g, 4.53 mmol) from step 1 above, in dry CH2Cl2 (5 mL) was added via cannula followed by triethylamine (3.16 g, 22.65 mmol). The reaction was stirred at −50° C. for 30 additional minutes and then allowed to reach room temperature. The reaction was poured into water (150 mL) and extracted with EtOAc (2×50 mL). The combined organics were washed with brine, dried over Na2SO4, filtered and concentrated. The residue was purified by flash column chromatography (0-20% EtOAc in hexanes) to give the product (0.58 g, 62% yield) as a clear oil. 1H NMR (400 MHz, CDCl3): δ 1.90 (s, 6H), 8.20 (s, 1H), 8.93 (s, 1H), 10.12 (s, 1H). ESIMS (MH+): 209.

Quelle