Dimethylformamide → (2S,4S)-N-{2-[4-(Diphenylmethyl)piperazin-1-yl]ethyl}-6-fluoro-2',5'-dioxospiro[chroman-4,4'-imidazolidine]-2-carboxamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 1-(2-aminoethyl)-4-diphenylmethylpiperazine (10.0 g, 33.9 mmol), 1,8-diazabicyclo[5,4,0]-7-undecene (10.9 g, 71.7 mmol) and N,N-dimethylformamide (90.0 ml, 1.16 mol) was chilled to -30° C. To the mixture was added over 30 minutes a solution of (2S, 4S)-6-fluoro-2',5'-dioxospiro[chroman-4,4'-imidazolidine]-2-carbonyl chloride (Reference Example 1, 10.0 g, 33.5 mmol) in N,N-dimethylformamide (90.0 ml, 1.16 mol) and the mixture was stirred for 15 hours at temperature of 15°-25° C. After distilling off the solvent, the reaction mixture was chromatographed on silica gel, eluted with CH2Cl2 /MeOH (9/1) and evaporated in vacuo to dryness to give the desired compound (12.2 g, 65.2%) as colorless amorphous substance.

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