Synthesis of Tertiary Amides from Anionically Activated Aromatic Trifluoromethyl Groups
作者:Gavin O’Mahony、Andrew K. Pitts
DOI:10.1021/ol100507n
日期:2010.5.7
In this paper, a novel synthesis of tertiary amides from anionically activated aromatic trifluoromethyl groups is presented. Anionically activated trifluoromethyl groups react with secondary amines under aqueous conditions to afford tertiary amides. The mechanism involves initial elimination of hydrogen fluoride by an E1cB mechanism to afford an electrophilic quinone methide- or azafulvene-type intermediate
I<sub>2</sub>-Catalyzed cross dehydrogenative coupling: rapid access to benzoxazinones and quinazolinones
作者:Kaili Chen、Biao Gao、Yanguo Shang、Jianyao Du、Qinlan Gu、Jinxin Wang
DOI:10.1039/c7ob02038d
日期:——
efficient and applicable I2-catalyzed intramolecular dehydrogenative C-O/C-N coupling reaction via activating the C-H bond adjacent to the N atom has been developed to provide dozens of substituted benzoxazinones (31 examples) and quinazolinones (5 examples) in good to excellent yields (up to 98%). This one-pot methodology has significant advantages, including metal-free process, broad substrate scope,
Hypervalent‐iodine‐mediated oxidative coupling of the two aryl groups in either 2‐acylamino‐N‐phenyl‐benzamides or 2‐hydroxy‐N‐phenylbenzamides, with concomitant insertion of the ortho‐substituted N or O atom into the tether, has been described for the first time. This unusual metal‐free rearrangement reaction involves an oxidative C(sp2)C(sp2) aryl–aryl bond formation, cleavage of a C(sp2)C(O) bond