已经发现三氟乙酸是用于串联克莱森重排和环化反应以从由S N 2反应获得的化合物产生3-芳基亚甲基-3,4-二氢-1 H-喹啉-2-酮的高效和高效试剂。DABCO存在下苯胺与丙烯酸Bayis-Hillman加合物的乙酰基衍生物之间的关系。相反,在三氟乙酸处理下,从Baylis-Hillman丙烯腈加成物的乙酰基衍生物获得的类似化合物通过串联Claisen重排,环化和异构化直接提供3-芳基甲基-2-氨基-喹啉。
1,3,5-Triaza-7-phosphaadamantane (PTA): A Practical and Versatile Nucleophilic Phosphine Organocatalyst
作者:Xiaofang Tang、Bo Zhang、Zhengrong He、Ruili Gao、Zhengjie He
DOI:10.1002/adsc.200700071
日期:2007.8.6
cycloaddition reaction of 4-substituted 2,3-butadienoates with N-tosylimines, PTA is also proven to be a comparable catalyst as tributylphosphine (PBu3). By systematic comparison with other structurally similar N,P catalysts, it is concluded that the superiority of PTA in the above nucleophilic catalysis is attributable to its comparable nucleophilicity with that of trialkylphosphines. The feasibility
Enantioselective desymmetrization of prochiral 1,3-dinitropropanes via organocatalytic allylic alkylation
作者:Soumya Jyoti Singha Roy、Santanu Mukherjee
DOI:10.1039/c3cc47645f
日期:——
An enantioselective desymmetrization of prochiral 1,3-dinitropropanes has been developed which proceeds via enantiogroup differentiating organocatalyticallylicalkylation. Densely functionalized products with two vicinal stereocenters were obtained generally with good to excellent diastereoselectivity (up to >20 : 1 dr) and superb enantioselectivity (up to >99 : 1 er).
Methylsulfenylation of Electrophilic Carbon Atoms: Reaction Development, Scope, and Mechanism
作者:Adriane A. Pereira、Amanda S. Pereira、Amanda C. de Mello、Arthur G. Carpanez、Bruno A. C. Horta、Giovanni W. Amarante
DOI:10.1002/ejoc.201601613
日期:2017.3.27
An innovative methodology for methylsulfenylation of electrophilic carbons is presented. Cheaper and commercially available dimethylsulfoxide (DMSO) is now used as a source of -SCH3 group. Chalcone, dibenzylideneacetone (DBA) as well as Morita-Baylis-Hillman (MBH) adduct derivatives were successfully sulfenylated, giving the corresponding products with moderate to high isolated yields. Control experiments
Electron-Donor–Acceptor Complex-Enabled Flow Methodology for the Hydrotrifluoromethylation of Unsaturated β-Keto Esters
作者:Gabriel M. F. Batista、Pedro P. de Castro、Hélio F. Dos Santos、Kleber T. de Oliveira、Giovanni W. Amarante
DOI:10.1021/acs.orglett.0c03187
日期:2020.11.6
(EDA) complex-enabled flow photochemical hydrotrifluoromethylation of unsaturated β-keto esters is described. The developed protocol has an easy experimental procedure and does not require the use of transition-metal-based photocatalysts, allowing the isolation of 14 new compounds in up to 86% yield. Control experiments and computational studies revealed that the reaction proceeds through a Michael-type
INDOLIZINONE BASED DERIVATIVES AS POTENTIAL PHOSPHODIESTERASE 3 (PDE3) INHIBITORS AND A PROCESS FOR THE PREPARATION THEREOF
申请人:COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:US20140296530A1
公开(公告)日:2014-10-02
The present invention provides compounds of general formula A useful as potential phosphodiesterase3 (PDE3) inhibitory agents and a process for the preparation thereof. The derivatives of formula A can be employed as therapeutics in human and veterinary medicine, where they can be used, for example, for the treatment and prophylaxis of the following diseases: heart failure, dilated cardiomyopathy, platelet inhibitors, cancer and obstructive pulmonary diseases.