A Pd-catalyzed, boron ester-mediated, reductive cross-coupling of two aryl halides to synthesize tricyclic biaryls
作者:Zhilong Chen、Xiaodong Wang
DOI:10.1039/c7ob01237c
日期:——
Tricyclic biaryls are important scaffold structures in many natural products and lead compounds in drug discovery. The formation of a biaryl unit is often the key step for the synthesis of tricyclic biaryls. Despite significant progress toward the synthesis of biaryl compounds in recent years, the direct cross-coupling of two different aryl halides is still challenging and robust methods are lacking
KO<sup><i>t</i></sup>Bu Mediated Synthesis of Phenanthridinones and Dibenzoazepinones
作者:Bhagat Singh Bhakuni、Amit Kumar、Shah Jaimin Balkrishna、Javeed Ahmed Sheikh、Sanjit Konar、Sangit Kumar
DOI:10.1021/ol301077y
日期:2012.6.1
Synthesis of substituted phenanthridinones and dibenzoazepinones has been realized from 2-halo-benzamides in the presence of potassium tert-butoxide and a catalytic amount of 1,10-phenanthroline or AIBN. This new carbon–carbon bond forming reaction gives direct access to various biaryl lactams containing six- and seven-membered rings chemoselectively. Carbon–carbon coupling seems to proceed by the generation
Substituted phenanthridin-6(5H)-ones were obtained in a two-step procedure involving a Suzuki cross-coupling reaction followed by a KOH-mediated anionic ring closure. The influence of the nature and the position of the substituents on the cyclization step were studied. This methodology offers a general and practical route to diversely substituted phenanthridin-6(5H)-ones. (C) 2010 Elsevier Ltd. All rights reserved.
Continuous flow photochemistry as an enabling synthetic technology: synthesis of substituted-6(5H)-phenanthridinones for use as poly(ADP-ribose) polymerase inhibitors
作者:Y. Fang、G. K. Tranmer
DOI:10.1039/c5md00552c
日期:——
Methods utilizing continuous flow photochemistry, an enabling synthetic technology, have been developed for the generation of phenanthridinones via an intramolecular photochemical cyclization of 2-chlorobenzamides for the purposes of generating poly(ADP-ribose) polymerase inhibitors. Herein we report 16 examples of a single-step flow photocyclization which produces substituted phenanthridinones in
Synthesis and Structure–Affinity Relationships of Selective High-Affinity 5-HT<sub>4</sub> Receptor Antagonists: Application to the Design of New Potential Single Photon Emission Computed Tomography Tracers
The work described herein aims at finding new potential ligands for the brain imaging of 5-HT4receptors (5-HT4Rs) using single-photon emission computed tomography (SPECT). Starting from the nonsubstituted phenanthridine compound 4a, exhibiting a Ki value of 51 nM on the 5-HT4R, we explored the structure–affinity in this series. We found that substitution in position 4 of the tricycle with a fluorine