Highly enantioselective catalytic Friedel–Crafts reactions of cyclic α-alkylidene β-oxo imides
作者:Harufumi Oyama、Masahisa Nakada
DOI:10.1016/j.tetasy.2015.01.004
日期:2015.2
Highly enantioselectivecatalytic Friedel–Crafts reactions of cyclic α-alkylidene β-oxo imides with indole, pyrrole, and furan derivatives at relatively low temperatures are described. The X-ray crystallographic analysis of the product revealed that the sense of enantioselectivity of the Friedel–Crafts reactions could be well explained by the proposed chelate model. The model was stabilized by an intramolecular
Highly Enantioselective Catalytic Asymmetric [2+2] Cycloadditions of Cyclic α-Alkylidene β-Oxo Imides with Ynamides
作者:Kazuaki Enomoto、Harufumi Oyama、Masahisa Nakada
DOI:10.1002/chem.201406189
日期:2015.2.9
Highly enantioselective catalytic asymmetric [2+2] cycloadditions of cyclic α‐alkylidene β‐oxo imides with ynamides are described. The high reactivity of the cyclic α‐alkylidene β‐oxo imide allows the [2+2] cycloadditions of a hindered substrate with unreactive ynamides at low temperature. The X‐ray crystallographic analysis of the product suggests that the enantioselectivity of the [2+2] cycloaddition
The preparation of imides via the palladium-catalyzed coupling reaction of organostannanes is described. The palladium-catalyzed coupling reaction of aryl-, heteroaryl-, and alkenyl(tributyl)stannanes with methyl N-[methoxy(methylthio)methylene]carbamate in the presence of Cu(I) thiophene-2-carboxylate (CuTC) affords imino ethers, which are converted to the corresponding imides in high yield through acid hydrolysis.