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

To a stirred solution of 3-hydroxy-thieno[3,2-c]pyridine-2-carboxylic acid ethyl ester (1.3 g, 5.82 mmol) and DMAP (35 mg, 0.29 mmol) in DCM (10 ml) at 0° C. was added DIPEA (2.5 ml, 14.0 mmol) and nonafluorobutylsulfonyl fluoride (1.36 ml, 7.56 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 (50 ml) and washed with water (30 ml). The organic phase was isolated, dried over sodium sulphate, filtered and evaporated to give a brown oil. The oil was purified by flash chromatography (Si-SPE, pentane:diethyl ether, gradient 100:0 to 70:30) to afford the title compound as a colourless oil which crystallised on standing (420 mg, 14%). LCMS (method B): RT=4.46 min, M+H+=508.

1. washwashed with water (30 ml)
2. customThe organic phase was isolated
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. customevaporated
6. customto give a brown oil
7. customThe oil was purified by flash chromatography (Si-SPE, pentane:diethyl ether, gradient 100:0 to 70:30)

ORD-Eintrag

ord-e98db72ae9e64c35b94c615af2a9ae20

Quelldatensatz

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07893085B2