Journal ArticleDOI
Improved methodology for photocyclization reactions
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In this paper, a stoichiometric amount of iodide plus propylene oxide in the absence of air was shown to be superior to a catalytic amount of iodine in the air.Abstract:
To photocyclize stilbenes, a stoichiometric amount of iodine plus propylene oxide in the absence of air is superior to a catalytic amount of iodine in the air. The propylene oxide prevents HI from photoreducing double bonds. The absence of air prevents photooxidative side reactions, shown in one case to be caused by a photogenerated oxidant, possibly hydrogen peroxideread more
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Isolation and synthesis of biologically active carbazole alkaloids
Journal ArticleDOI
Synthesis of Phenanthrenes and Polycyclic Heteroarenes by Transition‐Metal Catalyzed Cycloisomerization Reactions
TL;DR: The scope of this novel method for the preparation of polycyclic arenes is illustrated by thetotal synthesis of a series of polyoxygenated phenanthrenes that are close relatives of the anticancer agent combretastatin A-4, as well as by the total synthesis of the aporphine alkaloid O-methyl-dehydroisopiline and its naturally occurring symmetrical dimer.
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One hundred years of helicene chemistry. Part 1: non-stereoselective syntheses of carbohelicenes.
Marc Gingras,Marc Gingras +1 more
TL;DR: This first part of a series of three reviews on carbohelicenes will be devoted to a comprehensive report on non-stereoselective reactions and methods for producing helicenes, along with their functionalization.
Journal ArticleDOI
Enantioenriched Helicenes and Helicenoids Containing Main-Group Elements (B, Si, N, P).
TL;DR: Enantioenriched helicenic derivatives containing main-group elements B, Si, N, and P, either incorporated within the helical backbone or grafted to it, will be thoroughly presented.