Tributylvinyltin → 3-Bromo-2-ethenylpyridine

Temperatur

100 °C

A solution of 2,3-dibromopyridine (2.0 g, 8.44 mmol) in DMF (10 mL) was treated with tributyl(vinyl)tin (2.94 g, 9.29 mmol), LiCl (1.07 g, 25.32 mmol), and PdCl2(PPh3)2 (0.296 g, 0.422 mmol). The reaction mixture was heated at 100° C. for 18 hours. The mixture was extracted with hexanes (3×50 mL). The combined hexane layers were extracted with 1N HCl. The aqueous layer was neutralized with 1N NaOH, extracted with hexanes, and the extracts were dried (MgSO4), filtered, and concentrated to provide the desired product as a yellowish oil (0.83 g, 53% yield). MS m/z 184(MH+); 1H NMR (300 MHz, CD3OD) δ 5.53 (dd, J=10.80, 2.01 Hz, 1H), 6.33 (dd, J=16.83, 1.83 Hz, 1H), 7.08–7.26 (m, 2H), 7.96 (dd, J=8.05, 1.46 Hz, 1H), 8.44 (dd, J=4.76, 1.46 Hz, 1H); 13C NMR (300 MHz, CD3OD) δ 121.9, 122.4, 125.7, 134.9, 142.8, 149.5, 154.5.

1. extractionThe mixture was extracted with hexanes (3×50 mL)
2. extractionThe combined hexane layers were extracted with 1N HCl
3. extractionextracted with hexanes
4. dry with materialthe extracts were dried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated

ORD-Eintrag

ord-e91475039af94f64ae5591a9845e553f

Quelldatensatz

uspto-grants-2006_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07153848B2