The asymmetrichydrogenation of pyrimidines proceeded with high enantioselectivity (up to 99 % ee) using an iridium catalyst composed of [IrCl(cod)]2, a ferrocene‐containing chiral diphosphine ligand (Josiphos), iodine, and Yb(OTf)3 (cod=1,5‐cyclooctadiene). The chiral catalyst converted various 4‐substituted pyrimidines into chiral 1,4,5,6‐tetrahydropyrimidines in high yield. The lanthanide triflate
Reaction of β-alkoxyvinyl α-ketoesters with acyclic NCN binucleophiles – Scalable approach to novel functionalized pyrimidines
作者:Oleksandr O. Stepaniuk、Tymofii V. Rudenko、Bohdan V. Vashchenko、Vitalii O. Matvienko、Ivan S. Kondratov、Andrey A. Tolmachev、Oleksandr O. Grygorenko
DOI:10.1016/j.tet.2019.05.005
日期:2019.6
protocols for synthesis of series of low-molecular-weight di- and tri-substituted pyrimidines bearing a functional group at the 4th position, which rely on a base-mediated condensation of amidines or guanidines with β-alkoxyvinyl α-keto esters, have been developed. This approach allowed for multigram preparation of novel pyrimidine-4-carboxylates in 21–90% yield. The synthetic utility of these compounds
compounds containing [1,2,4]triazolo [1,5-a]pyridine (I), pyrazolo [1,5-a]pyridine (II), 1H-1,3-benzodiazole (III) and imidazo [1,2-a]pyrimidine (IV) backbones were designed and synthesized for PDE10A interaction. Among these compounds, 1H-1,3-benzodiazoles and imidazo [1,2-a]pyrimidines showed the highest affinity for PDE10A enzyme as well as good metabolic stability. Both classes of compounds were identified
含有[1,2,4]三唑[1,5- a ]吡啶(I),吡唑并[1,5- a ]吡啶(II),1 H -1,3-苯并二唑(III)和咪唑[设计并合成了1,2- α ]嘧啶(IV)骨架用于PDE10A相互作用。在这些化合物中,1 H -1,3-苯并二唑和咪唑并[1,2- a ]嘧啶类化合物对PDE10A酶的亲和力最高,且代谢稳定性良好。这两类化合物均被鉴定为选择性和有效的PDE10A酶抑制剂。
Access to α-Substituted Amino Acid Derivatives via 1,3-Dipolar Cycloaddition of α-Amino Ester Derived Nitrones
Amino acid derived nitrones were conveniently synthesized in good-to-excellent yields by condensation of α-ketoesters with N-benzylhydroxylamine. The cycloaddition reactions of these nitrones with different alkenes were investigated under thermal solvent-free conditions. Considering conversions, yields, and selectivities, alkyl vinyl ethers have proven to be valuable partners to achieve this transformation