Oxidative cleavage of α-sulfonyl ketones to carboxylic acids with Ce(NH4)2(NO3)6
摘要:
Tandem oxidative cleavage of alpha-sulfonyl arylketones 2 with the combination of Ce(NH4)(2)(NO3)(6) and O-2 in MeCN afforded carboxylic acids 3 in moderate to good yields. The plausible reaction mechanism has been discussed. (C) 2014 Elsevier Ltd. All rights reserved.
DOI:
10.1016/j.tetlet.2014.08.038
作为产物:
描述:
1-(p-tolyl)vinyl 4-methylbenzenesulfonate 在
eosin B disodium salt 作用下,
以
二甲基亚砜 为溶剂,
反应 1.0h,
以99%的产率得到4-甲基-2(对甲苯磺酰基)苯乙酮
Nickel-Catalyzed Kumada Reaction of Tosylalkanes with Grignard Reagents to Produce Alkenes and Modified Arylketones
作者:Ji-Cheng Wu、Lu-Bing Gong、Yuanzhi Xia、Ren-Jie Song、Ye-Xiang Xie、Jin-Heng Li
DOI:10.1002/anie.201205969
日期:2012.9.24
Open a new door: The first example of alkene synthesis from alkyl electrophiles with Grignard reagents using the Kumada cross‐coupling reaction strategy is reported. This method opens a new door for the Kumada cross‐coupling reaction, allowing alkenes to be prepared from the reaction of tosylalkanes with Grignard reagents.
Sulfated tungstate/dioxygen: a new catalytic system for oxysulfonylation of styrenes to form β-keto sulfones
作者:Ganesh D. Wagh、Snehalata B. Autade、Raghavendra V. Kulkarni、Krishnacharya G. Akamanchi
DOI:10.1039/d0nj01763a
日期:——
A new system for synthesis of a wide range of β-ketosulfones using sulfated tungstate as a heterogeneous catalyst and oxygen as an environmentally benign oxidant with aryl hydrazides and styrenes as reacting counterparts has been developed. The preliminary experimental results support the involvement of free radical species. Thus, aryl sulfonyl free radicals, generated by oxidation of aryl sulfonyl
Copper Triflate Mediated α-Monohalogenation of α-Diazo β-Ketosulfones with Ammonium Halides
作者:Ru-Ting Hsu、Meng-Yang Chang、Chieh-Kai Chan、Heui-Sin Wang
DOI:10.1055/s-0036-1589479
日期:——
Abstract Copper triflate mediated α-monohalogenation of α-diazo β-ketosulfones with ammonium halides provides the corresponding α-halo β-ketosulfones. Different metal triflates are investigated for this facile and efficient transformation. A plausible mechanism is proposed. Copper triflate mediated α-monohalogenation of α-diazo β-ketosulfones with ammonium halides provides the corresponding α-halo
Synthesis and antifungal activity of novel oxazolidin-2-one-linked 1,2,3-triazole derivatives
作者:Alejandra Ramírez-Villalva、Davir González-Calderón、Roxana I. Rojas-García、Carlos González-Romero、Joaquín Tamaríz-Mascarúa、Macario Morales-Rodríguez、Nieves Zavala-Segovia、Aydeé Fuentes-Benítes
DOI:10.1039/c7md00442g
日期:——
Novel oxazolidin-2-one-linked 1,2,3-triazolederivatives (4a–k) were synthesized by straightforward and versatile azide–enolate (3 + 2) cycloaddition. The series of compounds was screened for antifungal activity against four filamentous fungi as well as six yeast species of Candida spp. According to their efficiency and breadth of scope, they can be ordered as 4k > 4d > 4h > 4a, especially in relation
Aerobic oxysulfonylation of alkenes using thiophenols: an efficient one-pot route to β-ketosulfones
作者:Atul K. Singh、Ruchi Chawla、Twinkle Keshari、Vinod K. Yadav、Lal Dhar S. Yadav
DOI:10.1039/c4ob00776j
日期:——
We have developed a highly efficient synthetic route to β-ketosulfones via AgNO3 catalyzed oxysulfonylation of alkenes using thiophenols in the presence of air (O2) and K2S2O8 as eco-friendly oxidants. Thiophenols have been used as sulfonylation precursors for the first time in a dioxygen activation based radical process. Moreover, the protocol also offers a new and convenient method for the synthesis
我们已经开发出了一种高效的合成路线,该路线是在空气(O 2)和K 2 S 2 O 8作为生态友好型氧化剂的情况下,通过使用苯硫酚通过AgNO 3催化的烯烃的氧磺酰化反应。硫酚在基于双氧活化的自由基工艺中首次被用作磺酰化前体。此外,该方案还提供了一种在不使用任何引发剂的情况下,在室温下合成β-羟基硫化物的新型便捷方法。