A Convenient Conversion of Terminal Alkenes into Homologous Unsaturated and Doubly Unsaturated Esters
摘要:
Unsaturated and doubly unsaturated esters have been synthesized in two steps by the application of a radical xanthate transfer process of a simple methylsulfoxide starting material to a range of terminal alkenes. syn-Elimination of the sulfoxide gives alpha,beta-unsaturated esters, which coupled with a xanthate elimination yields alpha,beta,gamma,delta-unsaturated esters.
Palladium-Catalyzed Cascade sp<sup>2</sup> C–H Bond Functionalizations Allowing One-Pot Access to 4-Aryl-1,2,3,4-tetrahydroquinolines from <i>N</i>-Allyl-<i>N</i>-arylsulfonamides
palladium-catalyzed cascade reaction allowing an efficient synthesis of 4-aryl-1,2,3,4-tetrahydroquinolines from N-allyl-N-arylsulfonamides and benzenesulfonylchlorides. In this transformation, two C(sp2)–C(sp3) bonds were formed via activation of C(sp2)–H bonds. The reaction proceeds using the easily accessible catalyst PdCl2, with Li2CO3 as inexpensive base and CuBr as additive, and tolerates a wide variety of substituents
我们已经开发了钯催化的级联反应,可以从N-烯丙基-N-芳基磺酰胺和苯磺酰氯有效合成4-芳基-1,2,3,4-四氢喹啉。在此转换中,通过激活C(sp 2)-H键形成了两个C(sp 2)-C(sp 3)键。该反应使用容易获得的催化剂PdCl 2进行,其中Li 2 CO 3为廉价的碱,CuBr为添加剂,并且在两个反应伙伴上都可以耐受多种取代基。
FeBr3-catalyzed regioselective hydroxysulfenylation of N-allylsulfonamides with sulfonyl hydrazides
作者:Zhong-Qi Xu、Lin-Chuang Zheng、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1016/j.tet.2018.12.044
日期:2019.2
Regioselective hydroxysulfenylation of unactivated CC double bonds was reported. Using FeBr3-bpy as the catalyst, Na2S2O8 as the oxidant, and sulfonylhydrazides as the sulfenyl sources, hydroxysulfenylation of unfunctionalized olefins proceeded readily, giving a variety of β-hydroxysulfides in moderate to good isolated yields.
报道了未活化的C C双键的区域选择性羟基亚磺酰基化。使用FeBr 3 -bpy作为催化剂,使用Na 2 S 2 O 8作为氧化剂,使用磺酰肼作为亚磺酰基来源,未官能化烯烃的羟基亚磺酰基化反应容易进行,得到了各种中等至良好分离产率的β-羟基硫化物。
Radical cyclization reaction of iodine containing fluoroolefines
作者:Yu Ofuji、Tadashi Kanbara、Tomoko Yajima
DOI:10.1016/j.jfluchem.2021.109805
日期:2021.7
oxolane. The cyclized product acts as a radical precursor and adds to the olefin under UV irradiation. In addition, the difference in reactivity between 3 and 4 was clarified, and a double cyclization reaction of 4 with allylaniline was conducted.
A Highly Conjunctive β-Keto Phosphonate: Application to the Synthesis of Pyridine Alkaloids Xestamines C, E, and H
作者:Matthieu Corbet、Michiel de Greef、Samir Z. Zard
DOI:10.1021/ol702590f
日期:2008.1.1
The synthesis of a novel beta-keto gamma-xanthyl phosphonate has been achieved. This highly conjunctivereagent has been utilized in a combination of radical and ionic reactions to create new carbon-carbon bonds. Its usefulness was demonstrated by realizing the first total synthesis of naturally occurring pyridine alkaloids xestamines C, E, and H.
Ultrasound-assisted one-pot three-component synthesis of new isoxazolines bearing sulfonamides and their evaluation against hematological malignancies
作者:Aicha Talha、Cécile Favreau、Maxence Bourgoin、Guillaume Robert、Patrick Auberger、Lahcen EL Ammari、Mohamed Saadi、Rachid Benhida、Anthony R. Martin、Khalid Bougrin
DOI:10.1016/j.ultsonch.2021.105748
日期:2021.10
regioselective 1,3-dipolar cycloaddition. The present methodology capitalized on trichloroisocyanuric acid (TCCA) as a safe and ecological oxidant and chlorinating agent for the in-situ conversion of aldehydes to nitrileoxides in the presence of hydroxylamine hydrochloride, under ultrasound activation. These nitrileoxides could be engaged in 1,3-dipolar cycloadditionreactions with various alkene to