An efficient one-potsynthesis of 2H-pyranonaphthoquinone was achieved via a palladium-catalyzed C–H bondactivation/C–Cbond formation/intramolecular Tsuji–Trost reaction cascade. The unprecedented procedure exhibits excellent functional group tolerance, giving the target naphthoquinones in moderate to good isolated yields (40–88%) under mild reaction conditions. Scalable production of the product
Environmentally benign, one-pot synthesis of pyrans by domino Knoevenagel/6π-electrocyclization in water and application to natural products
作者:Ene Jin Jung、Byung Ho Park、Yong Rok Lee
DOI:10.1039/c0gc00265h
日期:——
In water medium, environmentally benign, facile, and efficient synthesis of pyrans was achieved in good yields by the reactions of a variety of cyclic 1,3-dicarbonyls with several α,β-unsaturated aldehydes. The key strategy was a formal [3+3] cycloaddition by domino Knoevenagel/6Ï- electrocyclization. This methodology was applied to the synthesis of biologically interesting pyranocoumarin, pyranoquinolinone, and pyranonaphthoquinone derivatives along with selected natural and non-natural products.
Indoleamine 2,3-Dioxygenase Is the Anticancer Target for a Novel Series of Potent Naphthoquinone-Based Inhibitors
作者:Sanjeev Kumar、William P. Malachowski、James B. DuHadaway、Judith M. LaLonde、Patrick J. Carroll、Daniel Jaller、Richard Metz、George C. Prendergast、Alexander J. Muller
DOI:10.1021/jm7014155
日期:2008.3.1
Indoleamine 2,3-dioxygenase (IDO) is emerging as an important new therapeutic target for the treatment of cancer, chronic viral infections, and other diseases characterized by pathological immune suppression. While small molecule inhibitors of IDO exist, there remains a dearth of high-potency compounds offering in vivo efficacy and clinical translational potential. In this study, we address this gap by defining a new class of naphthoquinone-based IDO inhibitors exemplified by the natural product menadione, which is shown in mouse tumor models to have similar antitumor activity to previously characterized IDO inhibitors. Genetic validation that IDO is the critical in vivo target is demonstrated using IDO-null mice. Elaboration of menadione to a pyranonaphthoquinone has yielded low nanomolar potency inhibitors, including new compounds which are the most potent reported to date (K-i = 61-70 nM). Synthetic accessibility of this class will facilitate preclinical chemical-genetic studies as well as further optimization of pharmacological parameters for clinical translation.
Synthesis, Characterization, and Antileukemic Properties of Naphthoquinone Derivatives of Lawsone
Naphthoquinones are considered privileged structures for anticancer drug molecules. The Heck reaction of 2‐hydroxy‐1,4‐naphthoquinone (lawsone) with 1‐bromo‐3‐methyl‐2‐butene offered easy access to lapachol. Several naturally occurring linear and angular heterocyclic quinoids (α‐lapachone, β‐lapachone, dunnione, and related analogues) were prepared from lapachol. Furthermore, we demonstrated that the