Effects of Silver Carbonate and <i>p</i>-Nitrobenzoic Acid for Accelerating Palladium-Catalyzed Allylic C–H Acyloxylation
作者:Aymen Skhiri、Haruki Nagae、Hayato Tsurugi、Masahiko Seki、Kazushi Mashima
DOI:10.1021/acs.orglett.1c02406
日期:2021.9.17
An allylic C–H acyloxylation of terminal alkenes with 4-nitrobenzoic acid was assisted by a bidentate-sulfoxide-ligated palladium catalyst combined with 1,4-benzoquinone and Ag2CO3 under mild reaction conditions. The catalytic activity was remarkably enhanced by Ag2CO3 as an additive and 4-nitrobenzoic acid as a carboxylate source; both components were essential to exhibiting high catalytic activity
在温和的反应条件下,末端烯烃与 4-硝基苯甲酸的烯丙基 C-H 酰氧基化反应由双齿亚砜连接的钯催化剂与 1,4-苯醌和 Ag 2 CO 3组合辅助。Ag 2 CO 3作为添加剂和4-硝基苯甲酸作为羧酸盐源显着提高了催化活性;这两种组分对于表现出高催化活性、高支链选择性和钯催化剂负载量低的宽底物范围都是必不可少的。7-辛烯酸乙酯 ( 1a ) 的支链选择性烯丙基酰氧基化得到产物 6,8-二羟基辛酸乙酯 ( 5 ),这是一种有用的合成中间体 ( R)-α-硫辛酸。