[EN] N-HETEROARYLALKYL-2-(HETEROCYCLYL AND HETEROCYCLYLMETHYL) ACETAMIDE DERIVATIVES AS SSTR4 AGONISTS [FR] DÉRIVÉS DE N-HÉTÉROARYLALKYLE-2-(HÉTÉROCYCLYLE ET HÉTÉROCYCLYLMÉTHYLE) ACÉTAMIDE UTILISÉS EN TANT QU'AGONISTES DE SSTR4
Catalytic, asymmetric difluorination of alkenes to generate difluoromethylated stereocenters
作者:Steven M. Banik、Jonathan William Medley、Eric N. Jacobsen
DOI:10.1126/science.aaf8078
日期:2016.7
difluoromethylated tertiary or quaternary stereocenters. The reaction uses commercially available reagents (m-chloroperbenzoic acid and hydrogen fluoride pyridine) and a simple chiral aryl iodide catalyst and is carried out readily on a gram scale. Substituent effects and temperature-dependent variations in enantioselectivity suggest that cation-π interactions play an important role in stereodifferentiation
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
Umpolung Reactivity of Difluoroenol Silyl Ethers with Amines and Amino Alcohols. Application to the Synthesis of Enantiopure α-Difluoromethyl Amines and Amino Acids
Difluoroenol silyl ethers, produced in situ from acylsilanes and CF3TMS, react as electrophiles with amines to give difluoroimines, via the corresponding hemiaminal adduct, as evidenced by F-19 NMR spectroscopy. Reaction with (R)-phenylglycinol led to 2-difluoromethyloxazolidines. After separation of the diastereomers, reduction with LAH and Strecker-type synthesis gave enantiopure alpha-difluoromethy-lamines and alpha-difluoromethyl-alpha-amino acids, respectively.