Perfluoro-1-butanesulfonyl fluoride → 3-(Nonafluorobutane-1-sulfonyloxy)-thieno[2,3-c]pyridine-2-carboxylic acid ethyl ester

To a stirred solution of 3-hydroxy-thieno[2,3-c]pyridine-2-carboxylic acid ethyl ester-(950 mg, 4.26 mmol) and DMAP (26 mg, 0.21 mmol) in DCM (12 ml) at 0° C. was added DIPEA (1.8 ml, 10.2 mmol) and nonafluorobutylsulfonyl fluoride (0.99 ml, 5.53 mmol). After 10 minutes the reaction mixture was warmed to room temperature and stirred for an additional 20 hours. The reaction mixture was diluted with DCM (30 ml) and washed with water (20 ml). The organic phase was dried over sodium sulphate, filtered and evaporated to give a yellow oil. The oil was purified by flash chromatography (Si-SPE, pentane:diethyl ether, gradient 90:10 to 65:35) to afford the title compound as a colourless oil which crystallised on standing (678 mg, 31%): LCMS (method B). RT=4.49 min, M+H+=508.

1. washwashed with water (20 ml)
2. dry with materialThe organic phase was dried over sodium sulphate
3. filtrationfiltered
4. customevaporated
5. customto give a yellow oil
6. customThe oil was purified by flash chromatography (Si-SPE, pentane:diethyl ether, gradient 90:10 to 65:35)

ORD-Eintrag

ord-51b6027be16940d3b31a7da3f4992b55

Quelldatensatz

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07893085B2