Synthesis and Properties of
<scp>
CF
<sub>3</sub>
</scp>
(
<scp>
OCF
<sub>3</sub>
</scp>
)
<scp>CH‐Substituted</scp>
Arenes and Alkenes
<sup>†</sup>
作者:Wen‐Qi Xu、Xiu‐Hua Xu、Feng‐Ling Qing
DOI:10.1002/cjoc.202000062
日期:2020.8
developed to access novel CF3(OCF3)CH‐containing compounds. Deprotonation of CF3(OCF3)CH‐substitutedarenes afforded synthetically useful CF3O‐substituted gem ‐difluoroalkenes. Furthermore, evaluation of the lipophilicities (log P ) indicated that CH(OCF3)CF3 is more lipophilic than the common fluorinated motifs such as CF3, OCF3, and SCF3, thus rendering the CH(OCF3)CF3 motif appealing in drug discovery
Asymmetric Construction of Pyrrolidines Bearing a Trifluoromethylated Quaternary Stereogenic Center via Cu<sup>I</sup>
-Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides with β-CF<sub>3</sub>
-β,β-Disubstituted Nitroalkenes
convenient method has been developed for the synthesis of opticallyactivepyrrolidines bearing a quaternary stereogenic center containing a CF3 group at the C‐3 position of the pyrrolidine ring. The synthesis system, CuI/Si‐FOXAP‐catalyzed exo‐selective 1,3‐dipolar cycloaddition of azomethine ylides with β‐CF3‐β,β‐disubstituted nitroalkenes, provides pyrrolidines with high diastereoselectivities (up to
(2) with a slope of unity over a wide range (108 in reactivity) of substituents from p-MeO to unsubstituted derivatives. The substituent effect on the solvolysis of 1 should be closer to that on the solvolysis of 2, rather than to the σ+ substituent effect. The ρ value for this system was estimated to be identical to the value of −6.3 assigned for 2, and the r value in the LArSR correlation to be comparable
The ruthenium-catalyzed asymmetric reductiveamination of aryl-trifluoromethyl ketones affording high value primary α-(trifluoromethyl)arylmethylamines using cheap NH4OAc as the nitrogen source and H2 as the reductant is reported. This user-friendly and simple catalytic method tolerates various aromatic functions with electron-withdrawing or -donating substituents at the para- or meta-positions and