Copper-Mediated Trifluoromethylation–Allylation of Arynes
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.8b00101
日期:2018.2.16
An unprecedented three-component copper-mediated vicinal trifluoromethylation–allylation of arynes is described. A wide range of structurally diverse trifluoromethylated allylarenes can be quickly assembled in one step. The application of the method has been demonstrated in the expedient synthesis of the CF3-containing analogue of the antispasmodic drug papaverine. The new reactivity of the [CuCF3]
Synthesis of enantioenriched 2,2-disubstituted pyrrolidines via sequential asymmetric allylic alkylation and ring contraction
作者:Elizabeth L. Goldstein、Hirokazu Takada、Yuji Sumii、Katsuaki Baba、Brian M. Stoltz
DOI:10.1016/j.tet.2022.132940
日期:2022.9
The synthesis of a variety of enantioenriched 2,2-disubstituted pyrrolidines is described. A stereogenic quaternary center is first formed utilizing an asymmetricallylicalkylation reaction of a benzyloxy imide, which can then be reduced to a chiral hydroxamic acid. This compound can then undergo a thermal “Spino” ring contraction to afford a carbamate protected 2,2-disubstituted pyrrolidine stereospecifically
Transition metal-free fluorocyclization of unsaturated N-methoxyamides gives cyclic N-methoxyimidates
作者:Fabio Cuzzucoli、Leanne Racicot、John F. Valliant、Graham K. Murphy
DOI:10.1016/j.tet.2022.132982
日期:2022.9
N-methoxyimidates was prepared by the intramolecular fluorocyclization of unsaturated N-methoxyamides. The reaction combined unsaturatedamides, a monofluoroiodane, and HFIP as the activator, and this induced an intramolecular fluorocyclization expeditiously at room temperature, giving the products in up to 81% yield in a single step. Two product isomers were chemoselectively produced, depending on whether