One-pot synthesis of α,β-dehydroamino derivatives from β,β-dicyanostyrene with 1,3-dibromo-5,5-dimethylhydantoin promoted by mild base
Zhanguo Chen , Manfei Du , Wei Xia , Junli Hu
Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1) : 68 -75.
One-pot synthesis of α,β-dehydroamino derivatives from β,β-dicyanostyrene with 1,3-dibromo-5,5-dimethylhydantoin promoted by mild base
The reaction of β,β-dicyanostyrene derivatives(1) with 1,3-dibromo-5,5-dimethylhydantoin(DBDMH) was systematicly studied. The reaction could generate different products when promoted by different mild bases. When the reaction was promoted by NaOAc(100%, molar ratio to compound 1), β,β-dicyanostyrene derivatives could be directly converted into corresponding α,β-dehydroamino derivatives in good to excellent yields in one-pot. When the reaction was promoted by K3PO4(80%, molar ratio to compound 1), the corresponding α,β-dehydroamino and double-α,β-dehydroamino compounds were simultaneously obtained and the total conversion of β,β-dicyanostyrene derivatives was up to 90% or higher.
β,β-Dicyanostyrene derivative / 1,3-Dibromo-5,5-dimethylhydantoin(DBDMH) / α,β-Dehydroamino
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