This work describes the optimization process for the synthesis of β-trifluoromethylated ketonesfrom trifluoromethylated allylicalcohols. This transformation proceeds through a ruthenium catalyzed isomerization under mild conditions with high atom economy. The effect of the CF3 group was analyzed and it provides fundamental insights into the isomerization reaction.
A synthetic approach to chiral β‐CF3‐substituted saturated carbonyl compounds has been developed in which ruthenium complexes efficiently catalyze the redoxisomerization of CF3‐bearing allylicalcohols by an intramolecular suprafacial enantiospecific 1,3‐hydrogen transfer (see scheme). This method was used for the enantioselective synthesis of (S)‐CF3‐citronellol.
Synthesis of α,γ-Chiral Trifluoromethylated Amines through the Stereospecific Isomerization of α-Chiral Allylic Amines
作者:Víctor García-Vázquez、Pablo Martínez-Pardo、Alexandru Postole、A. Ken Inge、Belén Martín-Matute
DOI:10.1021/acs.orglett.2c01436
日期:2022.6.3
imine/enamine intermediates, leading to γ-trifluoromethylated aliphatic amines with two noncontiguous stereogenic centers, in excellent yields and high diastereo- and enantioselectivities. This approach has been used with primaryamine substrates. This approach also provides a new synthetic pathway to chiral trifluoromethylated scaffolds, of importance in medicinal chemistry. Additionally, a gram-scale reaction
Phosphonium ylides in the multicomponent synthesis of pyrrolidines
作者:Evgeny M. Buev、Polina A. Khardina、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2022.154205
日期:2022.11
synthesis of pyrrolidines starting from phosphonium ylides, N-alkylglycines and carbonyl compounds was performed in 37–87% yields. This approach is based on a Wittig/Huisgen tandem reaction and simultaneous generation of the two reactive intermediates: alkene and azomethine ylide from the same carbonyl compound. Both stabilized and nonstabilized azomethine ylides were employed in this process allowing the construction