A tandem dearomatization/rearomatization strategy: enantioselective N-heterocyclic carbene-catalyzed α-arylation
作者:Zijun Wu、Jian Wang
DOI:10.1039/c8sc04601h
日期:——
the carbene-catalyzed tandem dearomatization/rearomatization reaction of azonaphthalenes with α-chloroaldehydes is described. This protocol enables the efficient assembly of chiral dihydrocinnolinone derivatives in good yields with excellent enantioselectivities (up to 99% ee). Moreover, this strategy enables not only the highlyenantioselective NHC-catalyzed nucleophilic aromatic substitution, but also
Enantioselective Synthesis of Spiroacetals via Silver(I)-Promoted Alkylation of Hemiacetals: Total Synthesis of Cephalosporolides E and F
作者:Stanley Chang、Robert Britton
DOI:10.1021/ol302694s
日期:2012.12.7
A silver(I)-promoted intramolecular hemiacetal alkylation has been developed that converts readily available keto-chlorodiols into functionalized spiroacetals containing 5,5-, 5,6-, and 5,7-membered ring systems. The efficiency of this process is demonstrated in a concise total synthesis of the fungal metabolites cephalosporolides E and F.
<i>N</i>-Heterocyclic Carbene-Catalyzed Atroposelective Synthesis of Axially Chiral α-Carbolinones via Heterocycle Formation
作者:Hai-Ying Wang、Zhi-Cheng Li、Chun-Lin Zhang、Song Ye
DOI:10.1021/acs.joc.3c01194
日期:2023.8.18
atroposelective synthesis of axially chiral α-carbolinones from α,β-unsaturated iminoindole derivatives and α-chloroaldehydes was developed. The reaction proceeds through a cascade process including [4 + 2] annulation and then oxidative dehydrogenation with concomitant central-to-axial chirality conversion undermildconditions. The developed method opens a new avenue to efficiently access axially chiral α-carbolinones