Palladium-Catalyzed, Enantioselective Formal Cycloaddition between Benzyltriflamides and Allenes: Straightforward Access to Enantioenriched Isoquinolines
摘要:
Benzyl and allyltriflamides can engage in Pd-catalyzed oxidative (4+2) annulations with allenes, to produce highly valuable tetrahydroisoquinoline or dihydropyridine skeletons. The reaction is especially efficient when carried out in the presence of designed N-protected amino acids as metal ligands. More importantly, using this type of chiral ligands, it is possible to perform desymmetrizing, annulative C-H activations of prochiral diarylmethylphenyl amides, and thus obtain the corresponding isoquinolines with high enantiomeric ratios.
Reductive Detriflylation of N-Triflylamides with Red-Al
摘要:
Reduction of cis-N-triflylaziridines with 10 equiv of Red-Al in toluene at -40 to 0 degrees C selectively afforded corresponding deprotected parent aziridines in good to high yields. N,N-Dialkyltriflylamides were also successfully cleaved under similar reaction conditions.
Intermolecular Radical C(sp
<sup>3</sup>
)−H Amination under Iodine Catalysis
作者:Alexandra E. Bosnidou、Kilian Muñiz
DOI:10.1002/anie.201901673
日期:2019.5.27
The direct amination of aliphatic C−H bonds has remained one of the most tantalizing transformations in organic chemistry. Herein, we report on a unique catalyst system, which enables the elusive intermolecular C(sp3)−H amination. This practical synthetic strategy provides access to aminated building blocks and fosters innovative multiple C−Hamination within a new approach to aminated heterocycles