Water → HCID 90449655, compound

Participants

Reaction Conditions

Reaction Steps

Sodium hydride (10.0 mg, 0.21 mmol) was dissolved in N,N-dimethylformamide (1 mL). Thereafter, diethyl malonate (13.0 μL, 0.086 mmol) was added to the above obtained solution under cooling on ice, and the thus obtained mixture was then stirred at 100° C. for 30 minutes. Thereafter, an N,N-dimethylformamide (0.5 mL) solution of 1-(2-(trimethylsilyl)ethyl) 1′-tert-butyl 5-(3-bromo-2-(bromomethyl)propyl)spiro[indoline-3,3′-pyrrolidine]-1,1′-dicarboxylate (51.1 mg, 0.080 mmol) was further added to the reaction solution under cooling on ice, and the thus obtained mixture was then stirred at 100° C. for 2 hours. Thereafter, water was added to the reaction solution, and the mixed solution was then extracted with ethyl acetate. The organic layer was washed with brine, and was then dried over anhydrous sodium sulfate, followed by concentration in vacuo. The obtained residue was purified by silica gel column chromatography (hexane ethyl acetate=5:1) to obtain 1-(2-(trimethylsilyl)ethyl) 1′-tert-butyl 5-((3,3-bis(ethoxycarbonyl)cyclobutyl)methyl)spiro[indoline-3,3′-pyrrolidine]-1,1′-dicarboxylate (20.8 mg, 41%) in the form of a colorless oily product.

Provenance & Evidence