检索结果-南通市图书馆

Facile Synthesis of N-Sulfonylcyclothioureas in Water

Chinese Journal of Chemistry 2011年第10期29卷 2081-2085页

作者：万国翔徐亮马晓思张勇王剑张坚马宁 Department of Chemistry School of Science Tianjin University Tianjin 300072 China

A sequential one-pot synthesis of N-sulfonylcyclothioureas from N-monosulfonyl diamines, CS2 and chloroace- tic acid at room temperature in water is described. In the absence of highly toxic thiophosgene and organic solvents, this method is environmentally benign. Simple reaction conditions, easy purification of the products, good yields and thioglycolic acid as the useful byproduct are also important attributes of this methodology. The plausible mechanism including tandem reactions is proposed.

关键词： sequential one-pot synthesis N-sulfonylcyclothiourea sulfonamides synthetic methods aqueous reac-tion tandem reactions

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis of Benzofuran-fused 1,4-Dihydropyridines via Bifunctional Squaramide-catalyzed Formal [4+2] Cycloaddition of Azadienes with Malononitrile

引用

Chinese Journal of Chemistry 2018年第12期36卷 1130-1134页

作者： Zheng GU BO Wu Guo-Fang Jiang Yong-Gui Zhou State Key Laboratory of Catalysis Dalian institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning 116023China College of Chemistry and Chemical Engineering Hunan UniversityChangshaHunan 410082China

An efficient bifunctional squaramide‐catalyzed Michael addition/cyclization of azadienes with malononitrile has been successfully developed, providing a facile access to chiral benzofuran‐fused 1,4‐dihydropyridines with excellent yields, wide substrate scope and up to 99% ee. Additionally, this formal [4+2] cycloaddition can be performed in gram scale without noticeable loss of yield and enantioselectivity.

关键词： 1,4‐dihydropyridines cycloaddition azadienes tandem reactions organocatalysis asymmetric synthesis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Recent advances of versatile reagents as controllable building blocks in organic synthesis

引用

Chinese Chemical Letters 2024年第2期35卷 24-43页

作者： Shaomin Chen Luigi Vaccaro Yanlong Gu Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Laboratory of Green S.O.C. Dipartimento di ChimicaBiologia e BiotecnologieUniversità degli Studi di PerugiaVia Elce di Sotto 8Perugia 06123Italy School of Chemistry and Chemical Engineering The Key Laboratory for Green Processing of Chemical Engineering of Xinjiang BingtuanShihezi UniversityShihezi 832004China

Diversity-oriented synthesis is a powerful and interesting synthetic tool for the rapid construction of structurally complex and privileged scaffolds from readily accessible starting *** date,diversity-oriented synthesis mostly relies on the employment of versatile *** reagents can be regulated as controllable and flexible building blocks for multipurpose *** the past decade,a variety of multifunctional reagents have been ***,most versatile reagents usually need multi-step synthesis,thus restricting their wide application to a large *** terms of the practicalities and universalities,we prefer to pay more attention to the utilization of simple and practical versatile reagents with multiple reactivities,mainly including atropaldehyde acetals,aryl methyl ketones,vinylene carbonate,vinyl azides,aryldiazonium salts,rongalite,halodifluoromethyl *** importantly,these versatile reagents can also play different roles simultaneously in the same reaction,in which their different reactivities are converged into the final target *** strategy can not only offer more possibilities for the synthesis of several active pharmaceutical ingredients,but also minimize the occurrence of some side reactions by lessening the varieties of ***,a perspective is given at the end of this review.

关键词： Versatile reagents Divergent synthesis Dual synthons Bond cleavage tandem reactions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extrapolation of the gold-catalyzed cycloisomerization to the palladium-catalyzed cross-coupling/cycloisomerization of acetylenic alcohols for the synthesis of polysubstituted furans:Scope and application to tandem processes

引用

Chinese Journal of Catalysis 2016年第2期37卷 288-299页

作者： Chandrasekar Praveen Paramasivan T.Pemmal 中央电化学研究所(科学与工业研究中心实验室)功能材料部中央皮革研究所(科学与工业研究中心实验室)有机化学部

This paper describes the development of an integrated approach for the preparation of diverse furan derivatives from acetylenic alcohols by gold and palladium catalyzed π-activation ***,this new method was found to be amenable to cyclooctyl-containing substrates,which represents a significant extension to this methodology compared with our previous ***,this newly developed method allowed for the direct construction of cyclooctyl furans from their synthetic precursors under Sonogashira *** results revealed that palladium played two major functions in these reactions,including（1） an essential catalyst in the cross-coupling reaction of the substrates;and（2）facilitating the cyclization of the acetylenic alcohol intermediates through a typical π-activation *** scope of this chemistry was highlighted by the one-pot synthesis of 3-iodofuran,which provided an opportunity for further functionalization（via coupling methods）.Finally,the AuBr3 protocol was also elaborated to domino cyclization/C-H activation reactions,as well as the cyclization of acyclic *** together,the results of this study demonstrate that gold and palladium catalysts can be used to complement each other in cyclization reactions.

关键词： Furan derivatives Cycloisomerization Gold catalysis Palladium catalysis One-pot operation tandem reactions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mesoporous Fe-Doped Carbon Electrocatalysts with Highly Exposed Active Sites for Efficient Synthesis of Hydrogen Peroxide and tandem Epoxidation of Propene

引用

Renewables 2023年第5期1卷 562-571页

作者： Ling-Yu Dong Ming-Hao Guan Yong-Qi Ren Guang-Ping Hao An-Hui Lu State Key Laboratory of Fine Chemicals Frontier Science Center for Smart MaterialsLiaoning Key Laboratory for Catalytic Conversion of Carbon ResourcesSchool of Chemical EngineeringDalian University of TechnologyDalian 116024

Catalytic tandem synthesis of fine chemicals using the in situ-formed intermediates by electrocatalytic reactions has increasingly attracted attention in recent *** difficulty lies in the low local concentration of intermediates because of the slow formation rates in the catalytically electrochemical *** showcase an efficient tandem epoxidation of propene,which is accelerated by the in situ-generated hydrogen peroxide(H_(2)O_(2)).The catalysts of iron-doped tubular mesoporous carbons feature ultrathin carbon walls and record-high exposed external surface areas,which enable a H_(2)O_(2) formation rate of 747.7 mmol gcat^(-1) h^(-1) at 0.4 V versus reversible hydrogen electrode,together with a H_(2)O_(2) Faradaic efficiency of nearly 100%.A positive correlation between the exposed external surface area and the oxygen reduction activity is experimentally *** utilizing the in situ-generated H_(2)O_(2),the tandem epoxidation of propylene displays a yield rate of 80.3μmol gTS-1^(-1) h^(-1) for propylene *** high performance originates from the high local concentration of H_(2)O_(2) surrounding the titanium silicalite-1 catalysts for propylene *** results may inspire other tandem electrochemical reactions by using the mesoporous catalysts for synthesis of building block chemicals.

关键词： hydrogen peroxide mesoporous carbon electrocatalysts propylene epoxidation tandem reactions

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：