反应详情

Lithium aluminum hydride (39.0 mg, 1.03 mmol) was dissolved in diethyl ether (5 mL). Thereafter, a diethyl ether (5 mL) solution of 1-(2-(trimethylsilyl)ethyl) 1′-tert-butyl 5-(3-ethoxy-2-(ethoxycarbonyl)-3-oxopropyl)spiro[indoline-3,3′-pyrrolidine]-1,1′-dicarboxylate (300 mg, 0.51 mmol) was added to the above obtained solution under cooling on ice, and the thus obtained mixture was then stirred at the same temperature as above for 1 hour. Thereafter, a saturated aqueous solution of sodium sulfate was added to the reaction solution, and the mixed solution was then filtered through a pad of celite, followed by washing with chloroform. The filtrate was concentrated in vacuo, and the obtained residue was then purified by silica gel column chromatography (chloroform:methanol=10:1) to obtain 1-(2-(trimethylsilyl)ethyl) 1′-tert-butyl 5-(3-hydroxy-2-(hydroxymethyl)propyl)spiro[indoline-3,3′-pyrrolidine]-1,1′-dicarboxylate (58.7 mg, 23%) in the form of a light red amorphous product.

1. temperatureunder cooling on ice
2. filtrationthe mixed solution was then filtered through a pad of celite
3. washby washing with chloroform
4. concentrationThe filtrate was concentrated in vacuo
5. customthe obtained residue was then purified by silica gel column chromatography (chloroform:methanol=10:1)