Friedel-Crafts Arylation of α-Hydroxy Ketones: Synthesis of 1,2,2,2-Tetraarylethanones
作者:Anil Kumar、Tej V. Singh、Sajesh P. Thomas、Paloth Venugopalan
DOI:10.1002/ejoc.201403438
日期:2015.2
Friedel-Crafts arylation of a-hydroxy ketones such as 2-hydroxy- 1,2,2-triarylethanones has been achieved with a variety of arenes and heteroarenes in the presence of Lewis or Bronsted acids. Both sterically hindered and unhindered 1,2,2,2-tetrarylethanones are formed in good to excellent yields by using a stoichiometric amount of triflic acid. The intermediacy of an a-keto carbenium ion has been proposed
在路易斯酸或布朗斯台德酸的存在下,已经用多种芳烃和杂芳烃实现了α-羟基酮例如2-羟基-1,2,2-三芳基乙酮的Friedel-Crafts芳基化。通过使用化学计量量的三氟甲磺酸,空间位阻和无位阻的 1,2,2,2-四芳基乙酮均以良好到极好的产率形成。已经提出了a-酮碳鎓离子的中间体。