Organophotoredox assisted cyanation of bromoarenes <i>via</i> silyl-radical-mediated bromine abstraction
作者:Maniklal Shee、Sk. Sheriff Shah、N. D. Pradeep Singh
DOI:10.1039/d0cc00163e
日期:——
The insertion of a nitrile (–CN) group into arenes through the direct functionalization of the C(sp2)–Br bond is a challenging reaction. Herein, we report an organophotoredox method for the cyanation of aryl bromides using the organic photoredox catalyst 4CzIPN and tosyl cyanide (TsCN) as the nitrile source. A photogenerated silyl radical, via a single electron transfer (SET) mechanism, was employed
Efficient Bimetallic Catalysis of Nitrile Hydration to Amides with a Simple Pd(OAc)<sub>2</sub>
/Lewis Acid Catalyst at Ambient Temperature
作者:Sicheng Zhang、Haosheng Xu、Chenlin Lou、Ahmed M. Senan、Zhuqi Chen、Guochuan Yin
DOI:10.1002/ejoc.201601495
日期:2017.4.10
accelerate the hydration of various nitriles to amides at ambient temperature with the simple Pd(OAc)2 salt as catalyst, whereas the reactions with Pd(OAc)2 alone were very sluggish. The formation of a heterobimetallic PdII/ScIII species has been proposed as the key species for the hydration that demonstrates a bimetallic synergistic effect in this process.
Direct Bis-Alkyl Thiolation for Indoles with Sulfinothioates under Pummerer-Type Conditions
作者:Peng Qi、Fang Sun、Ning Chen、Hongguang Du
DOI:10.1021/acs.joc.1c02502
日期:2022.1.21
applications. This approach enabled double C–H thiolation at the C2 and C3 of the indole in one pot. The mechanism studies suggested the thiolation was realized through the sulfoxonium salt rather than sulfenylcarboxylate.
Photocatalytic Indole Diels–Alder Cycloadditions Mediated by Heterogeneous Platinum-Modified Titanium Dioxide
作者:Spencer P. Pitre、Juan C. Scaiano、Tehshik P. Yoon
DOI:10.1021/acscatal.7b02223
日期:2017.10.6
Indole alkaloids represent an important class of molecules, with many naturally occurring derivatives possessing significant biological activity. One area that requires further development in the synthesis of indole derivatives is the Diels–Alder reaction. In this work, we expand on our previously developed heterogeneous protocol for the [4 + 2] cycloaddition of indoles and electron-rich dienes mediated
Na2CO3-Catalyzed N-Acylation of Indoles with Alkenyl Carboxylates
作者:Xiao-Yu Zhou、Xia Chen
DOI:10.1055/s-0037-1609937
日期:2019.1
Abstract The N-acylation of indoles has been accomplished via inorganic base catalysis. It provided an efficient and simple catalysis system for the preparation of N-acylindoles with alkenyl carboxylates as acylating agents. A broad variety of indoles undergo the smooth N-acylation using Na2CO3 as catalyst in MeCN at 120 °C to give the corresponding N-acylindoles in good to excellent yields. The N-acylation
摘要 吲哚的N-酰化已经通过无机碱催化完成。它为以链烯基羧酸盐为酰化剂制备N-酰化吲哚提供了有效而简单的催化体系。使用Na 2 CO 3作为催化剂在MeCN中于120°C对多种吲哚进行平滑的N-酰化反应,从而以良好或极好的收率得到相应的N-酰基吲哚。 吲哚的N-酰化已经通过无机碱催化完成。它为以链烯基羧酸盐为酰化剂制备N-酰化吲哚提供了有效而简单的催化体系。使用Na 2 CO 3作为催化剂在MeCN中于120°C对多种吲哚进行平滑的N-酰化反应,从而以良好或极好的收率得到相应的N-酰基吲哚。