<i>Meta</i>-
and <i>Para</i>-Difunctionalization of Arenes
via an <i>Ortho</i>-Magnesiation and a Subsequent
Sulfoxide-Magnesium Exchange
作者:Laurin Melzig、Christian Rauhut、Paul Knochel
DOI:10.1055/s-0028-1087984
日期:——
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