Highly Efficient Cs2CO3-Catalyzed 1,4-Addition of Me3SiCN to Enones with Water as the Additive
作者:Fu-Xue Chen、Jingya Yang、Yongbin Shen
DOI:10.1055/s-0029-1218653
日期:2010.4
A facile and efficient 1,4-addition of Me3SiCN to enones has been achieved with perfect regioselectivity using Cs2CO3 as catalyst. Thus, with 0.5 mol% of Cs2CO3 and 4 equivalents of H2O as the additive excellent yields (81-99%) of β-cyanoketones are obtained within one to five hours. Both aromatic and aliphatic enones are found suitable substrates for this protocol.
Conjugate Hydrocyanation of Chalcone Derivatives Using Ethyl Cyanoacetate as an Organic Cyanide Source
作者:Zheng Li、Junjun Yin
DOI:10.1002/cjoc.201600860
日期:2017.7
The conjugate hydrocyanation of chalcone derivatives using ethyl cyanoacetate as an organic cyanide source at room temperature under open air and transition metal‐free conditions was described. The protocol has advantages of using relatively cheap, less toxic, stable and easy‐to‐handle cyanating reagent, high yield, and mild reaction condition.
Chiral Sodium Phosphate Catalyzed Enantioselective 1,4-Addition of TMSCN to Aromatic Enones
作者:Fu-Xue Chen、Jingya Yang、Shaoxiang Wu
DOI:10.1055/s-0030-1258817
日期:2010.11
A facile enantioselective 1,4-addition of TMSCN to aromatic enones has been developed using chiral sodium phosphate. Thus, in the presence of 20 mol% of sodium salt generated in situ from (R)-3,3′-di(1-adamantyl)-1,1′-binaphthyl-2,2′-diylphosphoric acid and NaOH, β-cyano ketones were obtained in high yield (86-96%) and up to 72% ee within three hours at 80 ËC in toluene.
Highly Efficient Syntheses of β-Cyanoketones via Conjugate Addition of Me3SiCN to Aromatic Enones
作者:Jingya Yang、Fuxue Chen
DOI:10.1002/cjoc.201090182
日期:——
An efficient 1,4‐addition of Me3SiCN to aromatic enones has been achieved with excellent yields (91% –99%) using CsF (1 mol%) as the catalyst and H2O (4 equiv.) as the additive in refluxing dioxane within 7 h. The perfect regioselectivity is proposed accounting from H2O‐facilitated reversion of the 1,2‐adduct in the presence of CsF and subsequent irreversible 1,4‐addition reaction.
Conjugate Hydrocyanation of Aromatic Enones Using Potassium Hexacyanoferrate(II) as an Eco-Friendly Cyanide Source
作者:Zheng Li、Chenhui Liu、Yupeng Zhang、Rongzhi Li、Ben Ma、Jingya Yang
DOI:10.1055/s-0032-1317179
日期:——
A selective conjugate hydrocyanation of aromatic enones by a one-pot, two-step procedure usingpotassiumhexacyanoferrate(II) as an original eco-friendlycyanidesource, potassium hydroxide as a base, and benzoyl chloride as a promoter was described. This protocol has the advantages of a nontoxic cyanidesource, high yield, and simple workup procedure.
描述了使用六氰基高铁酸钾 (II) 作为原始环保氰化物源、氢氧化钾作为碱和苯甲酰氯作为促进剂,通过一锅两步法选择性共轭氢氰化芳族烯酮。该协议具有无毒氰化物源、高产率和简单后处理程序的优点。