Diisopropyl diazene-1,2-dicarboxylate → ethyl(S)-N,N'-bis(isopropoxycarbonyl)-2-cyano-2-hydrazino-2-phenylacetate

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Reaktionsschritte

To a solution of ethyl 2-cyano-2-phenylacetate (23.0 mg, 0.11 mmol) and (R,R)-trans-1-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(N,N-dimethylamino)cyclohexyl]thiourea (4.1 mg, 0.01 mmol) in toluene (1 mL) was added diisopropyl azodicarboxylate (21.5 μL, 0.10 mmol) at −78° C. After stirring for 15 min, the reaction mixture was concentrated. The residue was purified by silica gel column (hexane/ethyl acetate=3/1) to give the title compound (41.4 mg, yield: 100%, optical purity: 76% ee). Colorless amorphous

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