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
芳基亚砜部分可以方便地实现容易获得的二芳基亚砜的两步双官能化。高度官能化的1,2,4-三取代的芳烃和双官能化的杂芳烃(呋喃,噻吩,苯并呋喃和吡啶)按两步顺序制备,由芳基亚砜基触发。在第一个步骤中,将亚砜部分用作金属化导向组,允许平稳邻与TMPMgCl -magnesiation ⋅的LiCl(TMP =四甲基哌啶)。与亲电子猝灭反应后,将所得亚砜转化成第二镁试剂与我PrMgCl ⋅的LiCl(亚砜-镁交换),其可被捕获与各种亲电子。高化学选择性TMPMgCl⋅ LiCl和我PrMgCl ⋅的LiCl是具有宽范围的官能团(例如,氟,氯,CF的兼容3,CN,CO 2吨卜,炔基,醚,硫醚)。还报道了大规模反应(25–40 mmol)以及功能齐全的呋喃和噻吩的制备。