Silver(I)-Catalyzed Enyne Cyclization/Aromatization of Alkyne-Tethered Cyclohexadienones to Access Meta-Substituted Phenols
作者:Anandarao Munakala、Rambabu Chegondi
DOI:10.1021/acs.orglett.0c03819
日期:2021.1.15
Herein we report a highly regioselective silver(I)-catalyzed intramolecular annulation of alkyne-tethered cyclohexadienones to access meta-substituted phenols with enone functionality, which are difficult to synthesize from conventional methods. The reaction proceeds via intramolecular 1,6-enyne cyclization followed by aromatization and subsequent oxetene ring rearrangement. This strategy has also
We have developed a unique approach for the thermally promoted cycloaddition of cyclohexadienone-tethered allenes to form a versatile cyclobutane-fused oxygen-containing tricyclic framework in an environmentally friendly and atomic economic fashion with high regioselectivity. The reaction encompasses a broad substrate scope and functional group tolerance of cyclohexadienone moieties. Moreover, the
Lewis Acid-Driven Meyer–Schuster-Type Rearrangement of Yne-Dienone
作者:Rajendra K. Mallick、Srinivas Vangara、Nagarjuna Kommu、Tirumaleswararao Guntreddi、Akhila K. Sahoo
DOI:10.1021/acs.joc.1c00290
日期:2021.5.21
The reaction involves an uncommon 5-exo-trig 1,6-enyne cyclization of alkyne-tethered-cyclohexadienone, aromatization-triggered C–O bond cleavage, and an electrocyclic 4π-ring-opening of oxetene intermediate. This atom-efficient transformation provides access to a wide range of synthetically important α-(m-substituted phenol)-α,β-unsaturated ketones, featuring a broad scope with labile functional group
Divergent Synthesis of Fused Tricyclic Compounds via a Tandem Reaction from Alkynyl-cyclohexadienones and Diazoesters
作者:Guangyang Xu、Kai Liu、Jiangtao Sun
DOI:10.1021/acs.orglett.7b03356
日期:2017.12.1
toward several types of fused tricyclic scaffolds has been developed, by employing diazoesters and alkynyl-cyclohexadienones as starting materials, enabling rapid construction of diverse tricyclic compounds with multiple bonds formation in an operationally simple procedure. Typically, this controlled tandem sequence showcases the in situ formation of tetrasubstituted allenoates, an unprecedented anion-triggered
The electrochemical oxidation of a few methoxy substituted aromatic 3,3-sigmatropic systems yielded mixed quinone monoketals in aqueous methanol and dimerised products in anhydrous acetonitrile.