Asymmetric Decarboxylative Allylation of Oxindoles
摘要:
An asymmetric decarboxylative palladium-catalyzed allylation of alkyl- and aryl-substituted oxindoles has been developed, enabling the installation of an all-carbon quaternary chiral center at the oxindole 3-position in excellent yields and good to excellent enantioselectivity. An intriguing substrate-dependent reversal in stereoselectivity has been observed, whereby the size of the substituent determines the facial selectivity in the allylation step.
A novel, efficient and environmentally friendly synthetic method has been developed for C(sp)-H selenation of arylacetamides with readily available diselenides as selenating reagents at room temperature. This protocol is applicable to a list of wide-ranging arylacetamides and diselenides, and provides various α-selenylated aryl amide derivatives with high yield using choline hydroxide (ChOH) as a green