Ethyl Acetate → tert-butyl (1S,2R)-1-{[(S)-tert-butylsulfinyl]amino}-7-fluoroindane-2-carboxylate

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Reaction Steps

To a solution of 1.122 g of tert-butyl 3-{2-[(E)-{[(S)-tert-butylsulfinyl]imino}methyl]-3-fluorophenyl}propanoate (compound of Preparation Example 129) in 26.7 ml of THF was added 9.5 ml of lithium bis(trimethylsilyl)amide (1 M THF solution) at −78° C., followed by stirring at the same temperature for 8.5 hours. To the reaction mixture were added a saturated aqueous ammonium chloride solution and ethyl acetate to carry out a layer separation operation. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography to obtain 390 mg of tert-butyl (1S,2R)-1-{[(S)-tert-butylsulfinyl]amino}-7-fluoroindane-2-carboxylate (Preparation Example 113a), and 130 mg of each of tert-butyl (1R,2R)-1-{[(S)-tert-butylsulfinyl]amino}-7-fluoroindane-2-carboxylate and tert-butyl (1S,2S)-1-{[(S)-tert-butylsulfinyl]amino}-7-fluoroindane-2-carboxylate (Preparation Example 113b and Preparation Example 113c).

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