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DOI: 10.1055/s-0028-1087984
Meta- and Para-Difunctionalization of Arenes via an Ortho-Magnesiation and a Subsequent Sulfoxide-Magnesium Exchange
Publication History
Publication Date:
02 March 2009 (online)
Abstract
Highly functionalized 1,2,4-trisubstituted arenes can be prepared on large scale by a two-step sequence, triggered by an aryl sulfoxide group. In the first step, the sulfoxide moiety acts as a metalation directing group, allowing a smooth magnesiation with tmpMgCl˙LiCl. After a quenching reaction with an electrophile, the resulting sulfoxide is converted with i-PrMgCl˙LiCl into a second magnesium reagent (sulfoxide-magnesium exchange), which can be trapped with various electrophiles. The highly chemoselective tmpMgCl˙LiCl and i-PrMgCl˙LiCl are compatible with a broad range of functional groups (FG = F, Cl, CF3, CN, CO2 t-Bu, alkynyl).
Key words
metalation - ortho-magnesiation - sulfoxide-magnesium exchange - polyfunctional Grignard reagents
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