Bi(OTf)3-Mediated Cycloisomerization of γ-Alkynyl Arylketones: Application to the Synthesis of Substituted Furans
摘要:
A novel Bi(OTf)(3)-mediated cycloisomerization of gamma-alkynyl arylketones 4, 7, or 10 with molecular sieve (MS) in MeNO2 affords 3-substituted furans 3, 8, or 11 at rt for 3 h in moderate to good yields. The method provides mild, less-toxic, atom-economic and efficient conditions. The mechanism has been studied and proposed. Moreover, this route can be enlarged to gram scale.
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
Photo‐Mediated Decarboxylative Ketonization of Atropic Acids with Sulfonyl Hydrazides: Direct Access to
<i>β</i>
‐Ketosulfones
作者:Jie Chen、Zoe G. Allyson、Jing‐Rui Xin、Zhi Guan、Yan‐Hong He
DOI:10.1002/adsc.201901525
日期:2020.5.12
synthetically and biologically relevant β‐ketosulfones via a photo‐mediated decarboxylative ketonization of atropic acids was disclosed. The approach features metal‐free conditions, good functional group compatibility, readily available starting materials and the use of ubiquitous dioxygen as both oxygen source and oxidant. Furthermore, mechanistic studies reveal that the decarboxylative ketonization
Metal-free tetra-n-butylammonium bromide-mediated aerobic oxidative synthesis of β-ketosulfones from styrenes
作者:Xin Wan、Kai Sun、Guisheng Zhang
DOI:10.1007/s11426-016-0284-2
日期:2017.3
An efficient and broadly applicable protocol for the aerobic coupling of styrenes with sulfonylhydrazides has been developed that affords β-ketosulfones bearing various functional groups in moderate to excellent yields. The preliminary experimental results support the involvement of active benzyl radical species, and a radical pathway was therefore proposed for the reaction.
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
K2S2O8-mediated decarboxylative oxysulfonylation of cinnamic acids: A transition-metal-free synthesis of β-keto sulfones
作者:Ruchi Chawla、Ritu Kapoor、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2019.150964
日期:2019.8
oxidative decarboxylative sulfono functionalization of cinnamic acids with sulfinate salts mediated by K2S2O8 under aerobic conditions to afford synthetically and biologically relevant β-ketosulfones has been described. It is the first report on the transition-metal-free synthesis of β-ketosulfones from cinnamic acids, which employs environmentally benign, readily available and inexpensive starting materials
已经描述了在好氧条件下用K 2 S 2 O 8介导的亚磺酸盐对肉桂酸的氧化脱羧磺酰基官能化的新范例,以提供合成上和生物学上相关的β-酮砜。这是关于从肉桂酸无β-酮砜的无过渡金属合成的第一份报告,该方法采用了环境友好,易得且廉价的起始原料和氧化剂,即。空气和K 2 S 2 O 8。