Iodine → Tert-butyl 5-chlorospiro[indoline-3,3'-pyrrolidine]-1'-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of tert-butyl 5-chloro-2-oxospiro[indoline-3,3′-pyrrolidine]-1′-carboxylate (0.530 g, 1.64 mmol) in THF (5 mL) was added NaBH4 (0.311 g, 8.21 mmol). The reaction was cooled to about −20° C. to −10° C. A solution I2 (0.833 g, 3.28 mmol) in THF (3 mL) was added to the mixture dropwise. The reaction was stirred with warming to about room temperature overnight. The reaction was cooled to about 0° C. and quenched by the addition of saturated NH4Cl, and diluted with DCM. The organics were washed with Na2SO3 and brine, dried over MgSO4, filtered and concentrated. The crude residue was purified by column chromatography to yield tert-butyl 5-chlorospiro[indoline-3,3′-pyrrolidine]-1′-carboxylate (0.515 g, 100%). LCMS (APCI+) m/z 209, 211 [M+H-Boc]+; Rt=3.67 min.

Provenance & Evidence