74444-83-0Relevant academic research and scientific papers
[3+3] Annulation via Ring Opening/Cyclization of Donor–Acceptor Cyclopropanes with (Un)symmetrical Ureas: A Quick Access to Highly Functionalized Tetrahydropyrimidinones
Taily, Irshad Maajid,Saha, Debarshi,Banerjee, Prabal
, p. 7804 - 7813 (2019/12/27)
A mild and straight-forward access to pharmacologically privileged tetrahydropyrimidinones exploiting readily available Donor–Acceptor cyclopropanes (DACs) is reported. This methodology involves the Lewis acid catalyzed synthesis of uriedo-malonates from (un)symmetrical ureas and DACs followed by I2-base mediated cyclization to their corresponding tetrahydropyrimidinones. The cyclization protocol involves nucleophilic attack of the nitrogen of urea on the newly generated electrophilic acceptor end of DAC. The post functionalization offered potential biologically active molecules.
A practical and reusable catalyst for the synthesis of donor-acceptor cyclopropane
Zhang, Yanqun,Jin, Manyu,Wu, Cunqi,Zhao, Yongxia,Zhou, Hua,Xu, Jingwei
, p. 5 - 9 (2017/09/25)
Herein, a convenient, recyclable and inexpensive Cu-based catalytic system is developed for the synthesis of donor-acceptor (D-A) cyclopropane via the cycloaddition of styrene derivatives with diethyl bromomalonate. A core-shell catalyst of Fe3
Sc(OTf)3-Catalyzed [3 + 3] Cycloaddition of Cyclopropane 1,1-Diesters with Phthalazinium Dicyanomethanides
Liu, Honglei,Yuan, Chunhao,Wu, Yang,Xiao, Yumei,Guo, Hongchao
supporting information, p. 4220 - 4223 (2015/09/15)
The Sc(OTf)3-catalyzed diastereoselective [3 + 3] cycloaddition of phthalazinium dicyanomethanides with cyclopropane 1,1-diesters proceeded smoothly under mild reaction conditions, affording a variety of 3,4-dihydro-1H-pyrido[2,1-a]phthalazine derivatives in up to 99% yields with excellent diastereoselectivities.
Synthesis and anticonvulsant activity of new 6-methyl-1-substituted-4,6- diazaspiro[2.4]heptane-5,7-diones
He, Xianran,Qiu, Guanpeng,Yang, Jin,Xiao, Yuling,Wu, Zhongyuan,Qiu, Guofu,Hu, Xianming
experimental part, p. 3818 - 3830 (2010/09/10)
In the present study on the development of new anticonvulsants, twenty new 6-methyl-1-substituted-4,6-diazaspiro[2.4]heptane-5,7-diones were synthesized and tested for anticonvulsant activity using the maximal electroshock (MES) and subcutaneous pentylene
Latent Inhibitors. Part 7. Inhibition of Dihydro-orotate Dehydrogenase by Spirocyclopropanobarbiturates
Fraser, William,Suckling, Colin J.,Wood, Hamish C. S.
, p. 3137 - 3144 (2007/10/02)
A series of 5-spirocyclopropanobarbiturates bearing alkyl and aryl substituents on the cyclopropane ring has been synthesized.Dihydro-orotate dehydrogenase from Clostridium oroticum was shown to be inhibited by these compounds.A related series of 5-member
Copper(II) Halide Catalyzed Cyclopropanation of Olefins Involving Dehydrobromination of Bromomalonic Ester by Amine
Kawabata, Nariyoshi,Yanao, Shinji,Yoshida, Jun-ichi
, p. 2687 - 2688 (2007/10/02)
The reaction of olefins with bromomalonic ester and 1,8-diazabicycloundec-7-ene (DBU) proceeded in the presence of a catalytic amount of copper(II) halide to give 1,1-bis(alkoxycarbonyl)cyclopropane derivatives.DBU was converted into DBU-hydrobromi
A New Synthetic Route to Electrophilic Cyclopropane Derivatives from Olefins
Kawabata, Nariyoshi,Yano, Shinji,Hashimoto, Jiro,Yoshida, Jun-ichi
, p. 2539 - 2540 (2007/10/02)
1,1-Bis(alkoxycarbonyl)-, 1-alkoxycarbonyl-1-cyano-, and 1,1-dicyanocyclopropane derivatives were obtained in 10-99percent yields by the reaction of Br2C(COOR)2, Br2C(CN)(COOR), and KBr4, respectively, with olefins and Cu2Br2 in dimethyl sulfox
SYNTHESIS OF gem-DIALKOXYCARBONYLCYCLOPROPANE DERIVATIVES FROM OLEFINS BY THE REACTION WITH DIBROMOMALONIC ESTERS AND COPPER IN DIMETHYL SULPHOXIDE
Kawabata, Nariyoshi,Tanimoto, Masami
, p. 3517 - 3522 (2007/10/02)
A novel method for the synthesis of gem-dialkoxycarbonylcyclopropane derivatives is reported which involves the reaction of olefins with dibromomalonic esters and Cu in dimethyl sulphoxide.The reaction was applicable to a wide range of olefins and proceeded smoothly at moderate temperature to give the cyclopropane derivatives often in good yields.Cu was converted to Cu(II) bromide during the reaction.The reaction was weakly electrophilic and proceeded non-stereospecifically, and a stepwise mechanism involving addition and elimination appeared favourable for the reaction.In contrast, in the previously reported examples of the cyclopropanation of olefins by organic gem-dihalides and Cu in an aromatic hydrocarbon, Cu was concerted to Cu(I) halides and a concerted cycloaddition of carbenoid intermediates appeared favourable.
