Diethylaminosulfurtrifluoride reacted with cyclic ketoximes bearing substituent(s) that can stabilize a carbocation to cause fluorinative fragmentation, affording fluorinated carbonitrile. Ketoximes lacking such substituents afforded complex mixtures. However, the introduction of a sulfur functionality, which can stabilize a carbocation and can be easily removed from the reaction products, into the
Atroposelective construction of axially chiral enamides <i>via N</i>-allylic alkylation
作者:Qian-Yi Zhou、Xin Li
DOI:10.1039/d2cc01000c
日期:——
report the catalytic asymmetric synthesis of a unique family of axially chiral enamides in good yields with excellent enantioselectivities under mild conditions. These new axially chiral compounds feature a flexibleskeleton and a high degree of rotational freedom, which raises difficulties for enantiocontrol. A mechanism model is proposed to interpret the stereoselectivity, in which both the steric difference