开发了一种区域选择性可见光介导的 1,2,3-苯并三嗪-4(3 H )-酮的脱氮烯烃插入,以获取 3-取代异吲哚啉酮,这是许多生物活性分子和天然产物中存在的重要结构基序。值得注意的是,通过从报道的镍催化(其中形成 C3 取代的 3,4-二氢异喹啉-1(2 H )-酮)转向光催化,实现了不同的反应性,其中光催化脱氮和随后的氮介导的氢原子转移导致排他性3-取代异吲哚啉酮形成。所开发的光催化反应与活化的末端烯烃和环状α,β-不饱和酯和酮相容,对1,2,3-苯并三嗪-4(3 H )-酮的N-取代具有广泛的官能团耐受性。该过程的实用性通过克级合成和合成后酰胺化得以凸显。为了了解这种独特的产物选择性的起源,进行了实验和计算机制研究。
Graphene oxide‐catalyzed C
<sub>Sp3</sub>
–H activation of methylarenes in aqueous medium: A unified metal‐free access to amides and benzimidazoles
作者:Anshu Dandia、Dinesh Kumar Mahawar、Ruchi Sharma、Ranveer Singh Badgoti、Kuldeep S. Rathore、Vijay Parewa
DOI:10.1002/aoc.5232
日期:2019.11
Graphene oxide (GO)‐catalyzed selective synthesis of amides via CSp3–H activation of methylarenes and consequent C–N bond formation with anilines under aqueous medium has been described. Oxygen functionality allied with GO surface played a dual role both as acid catalyst and oxidizingagent to some extent. However, GO has a copious effect on the reaction, shown by a high TOF value with TBHP as co‐oxidant
Palladium-Catalyzed Oxidative CH Bond Acylation of Acetanilides with Benzylic Alcohols
作者:Yu Yuan、Duanteng Chen、Xiaowei Wang
DOI:10.1002/adsc.201100417
日期:2011.12
An efficient and clean method to construct CC bonds has been developed via the acylation reaction of acetanilides with benzylic alcohols using tert-butyl hydroperoxide (TBHP) as oxidant catalyzed by palladium acetate in the presence of triflic acid (TfOH). The acylation reactions exhibit excellent reactivities, and up to 95% yield of the corresponding aryl ketone could be obtained under the optimal
Metal-Free Sustainable Synthesis of Amides via Oxidative Amidation Using Graphene Oxide as Carbocatalyst in Aqueous Medium
作者:Anshu Dandia、Sonam Parihar、Pratibha Saini、Kuldeep S. Rathore、Vijay Parewa
DOI:10.1007/s10562-019-02878-5
日期:2019.11
We describe an efficient, clean and metal-free procedure for the synthesis of amides via oxidative amidation of aldehydes with anilines using graphene oxide (GO) as a recyclable catalyst and KBrO3 as a mild oxidant in aqueousmedium under microwave irradiation. GO nanosheets were prepared and characterized by XRD, TEM, SEM, and FT-IR, analyses. GO showed high compatibility with KBrO3 in water and offered
Copper-Catalyzed Direct Nitration on Aryl C–H Bonds by Concomitant Azidation–Oxidation with TMS Azide and TBHP under Aerobic Conditions
作者:Botla Vinayak、Malapaka Chandrasekharam
DOI:10.1021/acs.orglett.7b01489
日期:2017.7.7
An unprecedented copper-catalyzed in situ azidation–oxidation for the nitration of anilides and sulfonamides has been developed by direct CAr–H functionalization. This novel and efficient nitration protocol is achieved employing TMSN3 and TBHP without the exclusion of air or moisture. The synthetic applications of the 2-nitroanilides have been explored.
通过直接的C Ar -H功能化,开发出了前所未有的铜催化原位叠氮化氧化技术,用于苯胺和磺酰胺的硝化。使用TMSN 3和TBHP可以实现这种新颖而高效的硝化方案,而不会排除空气或湿气。已经研究了2-硝基苯胺的合成应用。
Triflic anhydride mediated synthesis of 3,4-dihydroquinazolines: a three-component one-pot tandem procedure
作者:Christina L. Magyar、Tyler J. Wall、Steven B. Davies、Molly V. Campbell、Haven A. Barna、Sydney R. Smith、Christopher J. Savich、R. Adam Mosey
DOI:10.1039/c9ob01596e
日期:——
A one-potthree-component tandem reaction involving a key Pictet-Spengler-like annulation step has been developed, providing an efficient method for the synthesis of 3,4-dihydroquinazolines in moderate to good yields from amides, aldehydes, and amines. The multicomponent triflic anhydride mediated reaction tolerates the installation of numerous functional groups, affording extensive diversity about