Sodium hydride → Ethyl 7-[(triisopropylsilyl)thio]chromane-2-carboxylate

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Reaction Steps

To a suspension of NaH (1.02 g, 25.6 mmol, 60% in mineral oil) in toluene (60 ml) was added triisopropylsilanethiol (4.24 g, 22.3 mmol). After stirring at room temperature for 30 min, to the mixture were added a solution of ethyl 7-{[(trifluoromethyl)sulfonyl]oxy}chromane-2-carboxylate (6.07 g, 17.1 mmol) in THF (60 ml) and tetrakis(triphenylphosphine) palladium (0.39 g, 0.34 mmol), and the mixture was degassed under N2. After heating at 90° C. for 1.5 h under N2, the solvents were evaporated and the residue was purified by column chromatography (EtOAc/Isooctane) to afford the title compound. Yield: 6.84 g. MS m/z (rel. intensity, 70 eV) 394 (M+, 27), 277 (52), 352 (26), 351 (bp), 251 (50).

Provenance & Evidence