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
The Profound Effect of the Ring Size in the Electrocyclic Opening of Cyclobutene-Fused Bicyclic Systems
作者:Michael J. Ralph、David C. Harrowven、Steven Gaulier、Sean Ng、Kevin I. Booker-Milburn
DOI:10.1002/anie.201410115
日期:2015.1.26
Fused cyclobutenes, prepared by the photocycloaddition of propargyl alcohols to cyclic anhydride chromophores, undergo facile thermochemical ringopening to fused γ‐lactones. The size of the fused ring profoundly influences the temperature that is required to facilitate the ringopening (from 50 °C to 180 °C) and the nature of the product that is formed. Our studies provide new insights into the mechanistic
An iron‐catalyzed denitrogenative rearrangement of 1,2,3,4‐tetrazole is developed over the competitive C(sp3)–H amination. This catalytic rearrangement reaction follows an unprecedented metalloradical activation mechanism. Employing the developed method, a wide number of complex‐N‐heterocyclic product classes have been accessed. The synthetic utility of this radical activation method is showcased with
Niacin receptor agonists, compositions containing such compounds and methods of treatment
申请人:Raghavan Subharekha
公开号:US20060293364A1
公开(公告)日:2006-12-28
The present invention encompasses compounds of Formula I:
as well as pharmaceutically acceptable salts and hydrates thereof, that are useful for treating atherosclerosis, dyslipidemias and the like. Pharmaceutical compositions and methods of use are also included.
process has been developed for the iridium(I)‐catalyzed vinylic C−H borylation of α,β‐unsaturated esters with bis(pinacolato)diboron (B2pin2). These reactions proceeded in octane at temperatures in the range of 80–120 °C to afford the corresponding alkenylboronic compounds in high yields with excellent regio‐ and stereoselectivities. The presence of an aryl ester led to significant improvements in the