Iodine → 2-Methoxy-3-iodo-5-(trifluoromethyl)pyridine

Temperatur

0 °C

2-Methoxy-3-trimethylsilyl-5-trifluoromethylpyridine (1.30 g, 5.21 mmol) in methanol (15 ml) was treated with silver tetrafluoroborate (1.22 g, 6.27 mmol), cooled to 0° C. and then iodine (1.32 g, 5.20 mmol) in methanol (25 ml) was slowly added. The solution was stirred at 0° C. for 4 hrs then at 22° C. for 16 hrs, before being refluxed for 8 hrs. After cooling, dichloromethane (50 ml) was added and the solution was washed with sodium thiosulphate solution (30 ml), brine (50 ml), then dried (Na2SO4) and concentrated to give a 1:1 mixture of the product and starting material as an oil (1.23 g).

1. waitat 22° C. for 16 hrs
2. temperaturebefore being refluxed for 8 hrs
3. temperatureAfter cooling
4. washthe solution was washed with sodium thiosulphate solution (30 ml), brine (50 ml)
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customto give
8. additiona 1:1 mixture of the product

ORD-Eintrag

ord-b9abaf0d85f147479c68c06e63507b70

Quelldatensatz

uspto-grants-2001_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06225320B1