Transition Metal‐Free, Free‐Radical Sulfenylation of the α‐C(
<i>sp</i>
<sup>3</sup>
)−H Bond in Arylacetamides and Its Application Toward 2‐Thiomethyl Benzoxazoles Synthesis
作者:Shanghui Tian、Chaoli Wang、Jianhui Xia、Jie‐Ping Wan、Yunyun Liu
DOI:10.1002/adsc.202100816
日期:2021.10.5
This paper reports the transition metal-free C(sp3)−H sulfenylation of arylacetamides by using thiophenols as the sulfenyl reagents. The reactions take place in the presence of only K3PO4. Control experiments indicate that the reactions proceed via a featured sulfur-centred free radical intermediate. In addition, the synthesis of 2-thiomethyl benzoxazoles has been realized via the p-toluenesulfonic
本文报道了使用苯硫酚作为亚苯基试剂对芳基乙酰胺进行无过渡金属的 C( sp 3 )-H 亚苯基化反应。反应仅在 K 3 PO 4存在下发生。对照实验表明反应通过以硫为中心的自由基中间体进行。此外,2-硫甲基苯并恶唑的合成是通过对甲苯磺酸(p- TSA)促进的苯磺酰化产物的环化实现的。
Copper-catalyzed C5-regioselective C H sulfonylation of 8-aminoquinoline amides with aryl sulfonyl chlorides
作者:Jun-Ming Li、Jiang Weng、Gui Lu、Albert S.C. Chan
DOI:10.1016/j.tetlet.2016.04.011
日期:2016.5
8-aminoquinoline scaffolds in the unusual C5 position was developed. The protocol using inexpensive CuI as the catalyst and commercially available aryl sulfonyl chlorides as the sulfonylation reagents, shows broad substrate scope, producing moderate to good yield of sulfone. The developed method was conveniently applied to synthesize a potential fluorinatedPET radioligand of 5-HT6 serotoninergic receptor. Moreover
A palladium catalyzed reductive aminocarbonylation of benzylic ammonium triflates with nitroarenes for the synthesis of phenylacetamides was developed. Using Pd(acac)2/DPPF catalystsystem, a range of different substituted phenylacetamides were prepared in moderate to good yields from benzylic ammonium triflates and nitroarenes through Csp3−N bond cleavage. A variety of alkyl, aryl, and halide substituents
A simple and efficient copper-catalyzed monofluoromethylation of 8-aminoquinolines with 2-bromo-2-fluoroacetate has been described with HPO(OMe)2 (dimethyl phosphonate) as reductant. The reaction tolerates a variety of quinoline amides and monofluoroalkyl bromides. Significant advantages of this protocol include synthetic convenience and high reaction efficiency.
A copper‐catalyzed 8‐amide chelation‐induced remoteC−Hamination of quinolines has been developed. This direct amination with readily available azodicarboxylates proceeded with perfect C5‐regioselectivity offering amino‐substituted 8‐aminoquinolines, important bioactive molecular scaffolds, in very high yields (up to 96 %). A single‐electron transfer (SET)‐mediated mechanism with kH/kD=1.1 was proposed
已经开发了铜催化的8-酰胺螯合诱导的喹啉远程CH胺化反应。这种容易获得的偶氮二羧酸酯直接胺化反应具有完美的C5区域选择性,能够以非常高的收率(高达96%)提供氨基取代的8-氨基喹啉(重要的生物活性分子支架)。捕获自由基中间体后,提出了单电子转移(SET)介导的k H / k D = 1.1的机理。