<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
高度官能化的1,2,4-三取代的芳烃可以由芳基亚砜基团触发的两步顺序大规模制备。在第一步中,亚砜部分充当金属化导向基团,允许用tmpMgCl 3 LiCl平滑地放大。与亲电试剂猝灭后,生成的亚砜被i -PrMgCl 3 LiCl转化为第二种镁试剂(亚砜-镁交换),可以被各种亲电试剂捕获。具有高度化学选择性的tmpMgCl 3 LiCl和i -PrMgCl 3 LiCl与多种官能团(FG = F,Cl,CF 3,CN,CO 2 t- Bu,炔基)兼容。 金属化-邻位镁化-亚砜-镁交换-多官能格氏试剂