Efficient synthesis of imidazole and pyrimidine derivatives
作者:Oleksii O. Kolomoitsev、Eugene S. Gladkov、Volodymyr M. Kotlyar、Polina I. Pedan、Oleksandr V. Onipko、Oleksandr V. Buravov、Valentyn A. Chebanov
DOI:10.1007/s10593-020-02818-x
日期:2020.10
and affordable synthetic pathway for obtaining new α-aminoamidines starting from aminonitriles is proposed. The α-aminoamidines obtained can be applied as substrates for further transformations and synthesis of imidazole- and pyrimidine-containing building blocks.
The invention relates to a compound of formula (I)
wherein R
1
to R
4
are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.
acids can mimic PTMs. However, reversible SPMs at hydrophobic amino acid residues in proteins are especially limited. Here, we report a tyrosine (Tyr)-selective SPM utilizing persistent iminoxyl radicals, which are readily generated from sterically hindered oximes via single-electron oxidation. The reactivity of iminoxyl radicals with Tyr was dependent on the steric and electronic demands of oximes;
The Synthesis of Ketone-Derived Enamides by Elimination of HCN from Cyanoamides
作者:Guilhem Coussanes、Katharina Gaus、Anthony C. O'Sullivan
DOI:10.1002/ejoc.201600638
日期:2016.8
available ketone-derived cyanoamides with NaOtBu leads to enamides in a simple, scalable, and inexpensive one-step operation in good yield. Enamides not stabilized by conjugation or by inclusion in a ring can also be prepared. An E1cB mechanism consistent with all results and observations, is proposed. The Z geometry of the product enamide is highly favoured, and the regioselectivity can be directed
用 NaOtBu 处理容易获得的酮衍生的氰胺,可以通过简单、可扩展且廉价的一步操作以良好的收率获得烯酰胺。也可以制备未通过共轭或包含在环中而稳定的烯酰胺。提出了与所有结果和观察结果一致的 E1cB 机制。产物烯酰胺的 Z 几何结构受到高度青睐,区域选择性可以通过保护基团的选择来指导。