stereocenters bearing both a trifluoromethylthio (SCF3) group and a cyano group has been realized, through asymmetric organophosphine-catalyzed Mannich-typereactions. The products were obtained in high yields and moderate to high enantioselectivities. Two diastereoisomers could be isolated from each reaction (overall 25 examples), rendering this approach a viable opportunity for molecular diversity generation
Trifluoromethylthiolation–arylation of diazocarbonyl compounds by modified Hooz multicomponent coupling
作者:Marvin Lübcke、Dina Bezhan、Kálmán J. Szabó
DOI:10.1039/c9sc00829b
日期:——
arise from different reagents. Our studies show that the reaction mechanism is similar to the Hooz multicomponent coupling. The process involves in situ generation of BAr3, which reacts with a diazocarbonylcompound, and the reaction is terminated by an electrophilic SCF3 transfer. The reaction can also be extended to fluorination based bifunctionalization which proceeds with somewhat lower yield than
A practical protocol for hydrotrifluoromethylthiolation of diazo compounds has been developed. A range of diazo compounds in combination with a nucleophilic SCF3 source provided access to valuable trifluoromethylthiolated compounds. Furthermore, a methodology for the first double trifluoromethylthiolation was developed.
A highly enantioselective one-potsynthesis of functionalized triflones, bearing a quaternary stereocenter, has been developed, exploiting the Michael reaction of α-(trifluoromethylsulfonyl) aryl acetic acidesters with N-acryloyl-1H-pyrazole catalyzed by commercially available Takemoto’s catalyst, followed by nucleophilic acyl substitution with alcohols. Preliminary investigations highlighted the