Triethylamine → 3-Chloropyridine-2-carbonitrile

Beteiligte Stoffe

Reaktionsschritte

Compound 44A (2.59 g, 20 mmol), trimethylsilylcyanide (5.95 g, 60 mmol), Et3N (4.05 g, 40 mmol), and acetonitrile (20 mL) were combined in a 3-necked 250-mL round-bottomed flask under nitrogen and refluxed for 6 h, at which time HPLC analysis indicated complete consumption of starting material. The cooled reaction mixture was concentrated under reduced pressure to give a brown semi-solid which was partitioned between 3 N aqueous Na2CO3 and CH2Cl2. The organic layer was washed with water, brine, dried (MgSO4), filtered, and concentrated under reduced pressure. The residue was purified by flash chromatography using 5% Et2O/CH2Cl2 as eluent to give the product 44B as a white crystalline solid (1.84 g, 67%). 1H NMR (CDCl3) 7.37 (dd, J=4.7, 8.4 Hz, 1H), 7.73 (dd, J=1.4, 8.2 Hz, 1H), 8.47 (dd, J=1.3, 4.6 Hz, 1H); LC/MS m/z 139 [M+H]+.

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