<i>Meta</i>- and <i>Para</i>-Difunctionalization of Arenes via a Sulfoxide−Magnesium Exchange Reaction
作者:Christian B. Rauhut、Laurin Melzig、Paul Knochel
DOI:10.1021/ol801431z
日期:2008.9.1
The aryl sulfoxide moiety (ArSO) allows an expedient two-step meta-, para-difunctionalization of readily available diarylsulfoxides. In the first step, the sulfoxide plays the role of a directing metalation group. In the second step, triggered by i-PrMgCl x LiCl, it becomes a leaving group and undergoes a regioselective sulfoxide-magnesiumexchange.
芳基亚砜部分(ArSO)可以方便地进行易得的二芳基亚砜的两步间,对二官能化。在第一步中,亚砜起着直接金属化基团的作用。在第二步中,由i-PrMgCl x LiCl触发,它成为一个离去基团,并进行区域选择性的亚砜-镁交换。
Difunctionalisation of Arenes and Heteroarenes by Directed Metallation and Sulfoxide–Magnesium Exchange
作者:Laurin Melzig、Christian B. Rauhut、Nikolaus Naredi‐Rainer、Paul Knochel
DOI:10.1002/chem.201003657
日期:2011.5.2
The aryl sulfoxide moiety allows an expedient two‐step difunctionalisation of readily available diaryl sulfoxides. Highly functionalised 1,2,4‐trisubstituted arenes and difunctionalised heteroarenes (furans, thiophenes, benzofurans and pyridines) were prepared in a two‐step sequence, triggered by an aryl sulfoxide group. In the first step, the sulfoxide moiety acts as a metallation‐directing group
<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