Synthesis and Cyclodehydration of Hydroxyphenols: A New Stereoselective Approach to 3-Aryl-2,3-dihydrobenzofurans
作者:Ferruccio Bertolini、Paolo Crotti、Valeria Di Bussolo、Franco Macchia、Mauro Pineschi
DOI:10.1021/jo070316q
日期:2007.9.1
A novel and simple method for the stereoselective synthesis of substituted 3-aryl-2,3-dihydrobenzofurans by intramolecular cyclization of hydroxyphenols is described. The stereoselective ortho-C-alkylation of phenols allows a novel and stereoselective access to a diverse array of polyfunctionalized products containing a diarylmethane stereogenic center without the need for time-consuming protection−deprotection
stereoselective direct carbon-carbon coupling of readily available aryl borates with N-protected aryl aziridines provides a method for the synthesis of new 2-(o-hydroxyaryl)-2-aryl ethylamines which can be used, in a novel annulation sequence, to give stereodefined substituted 3-aryl indolines. [reaction: see text]
RED PHOSPHORESCENT COMPOUND AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME
申请人:Park Chun Gun
公开号:US20090085476A1
公开(公告)日:2009-04-02
Disclosed herein is a red phosphorescent compound represented by Formula 1 below:
wherein
Further disclosed herein is an organic electroluminescent (EL) device using the red phosphorescent compound.
A conceptually new regioselective and highly syn-stereoselective intermolecular Friedel–Crafts-type O-alkylation of phenols with aryl epoxides by the use of appropriately substituted aryl borates is reported. The carbon–carbon bond formation occurs in neutral and mild conditions without the need for external Lewis acids or transition metal catalysts.
Mild and Stereoselective Friedel-Crafts Alkylation of Phenol Derivatives with Vinyloxiranes: A New Access to Cycloalkenobenzofurans
作者:Mauro Pineschi、Ferruccio Bertolini、Valeria Di Bussolo、Paolo Crotti
DOI:10.1055/s-2007-992353
日期:2007.12
The ring opening of vinyloxiranes with aryl borates under very mild and neutral conditions affords new hydroxyphenols with interesting levels of regio- and stereoselectivity. The subsequent Mitsunobu-type cyclodehydration proceeds with a good yield giving a new and easy access to cycloalkenobenzofurans.