Tetrahydropyridines via FeCl<sub>3</sub>-Catalyzed Carbonyl–Olefin Metathesis
作者:Katie A. Rykaczewski、Emilia J. Groso、Hannah L. Vonesh、Mario A. Gaviria、Alistair D. Richardson、Troy E. Zehnder、Corinna S. Schindler
DOI:10.1021/acs.orglett.0c00918
日期:2020.4.3
the application of Lewis-acid-catalyzed carbonyl–olefin metathesis toward the synthesis of substituted tetrahydropyridines from commercially available aminoacids as chiral pool reagents. This strategy relies on FeCl3 as an inexpensive and environmentally benign catalyst and enables access to a variety of substituted tetrahydropyridines under mild reaction conditions. The reaction proceeds with complete
Organoselenium-Catalyzed Cross-Dehydrogenative Coupling of Alkenes and Azlactones
作者:Wei Wei、Xiaodan Zhao
DOI:10.1021/acs.orglett.2c00117
日期:2022.3.11
The carbon–carbonbond-formingcross-dehydrogenativecoupling of alkenes and azlactones by organoselenium catalysis involving a high-valent para-methoxyphenyl selenium species is disclosed. A series of α,α-disubstituted α-amino acid derivatives were obtained in excellent regioselectivities through vinyl or allylic C–H functionalization. The generality of the method was elucidated by the cross-coupling
Enantioselectivebromolactonization of trisubstituted olefinicacids producing synthetically useful chiral lactones with two contiguous asymmetric centers has remained mainly unexplored except for the 6‐exo cyclization mode. In this work, the 5‐exo‐ and 6‐endo modes of bromocyclization of trisubstituted olefinicacids were enabled for the first time using N‐bromosuccinimide and a pyridyl phosphoramide
Diastereoselective Radical Aminoacylation of Olefins through N-Heterocyclic Carbene Catalysis
作者:Wen-Deng Liu、Woojin Lee、Hanyu Shu、Chuyu Xiao、Huiwei Xu、Xiangyang Chen、Kendall N. Houk、Jiannan Zhao
DOI:10.1021/jacs.2c11209
日期:2022.12.14
There have been significant advancements in radical-mediated reactions through covalent-based organocatalysis. Here, we present the generation of iminyl and amidyl radicals via N-heterocyclic carbene (NHC) catalysis, enabling diastereoselective aminoacylation of trisubstituted alkenes. Different from photoredox catalysis, single electron transfer from the deprotonated Breslow intermediate to O-aryl
strategy for the construction of chiral sulfides by catalytic enantioselective hydrothiolation of alkenes via an electrophilic pathway has been developed. Using this strategy, cyclic and acyclic unactivated alkenes efficiently afforded various chiral products in the presence of electrophilic sulfur reagents and silanes through chiral chalcogenide catalysis. The obtained products were easily transformed