Results 231 to 240 of about 7,405 (269)

Iron-catalyzed vinylogous aldol condensation of Biginelli products and its application toward pyrido[4,3-d]pyrimidinones.

Journal of Organic Chemistry, 2014
A novel iron-catalyzed vinylogous aldol condensation of Biginelli products with aryl aldehydes has been developed for the syntheses of potential bioactive (E)-6-arylvinyl-dihydropyrimidin-2(1H)-ones.
Lianqiang Zhang, Zhiguo Zhang, Qingfeng Liu, Tongxin Liu, Guisheng Zhang   +4 more
semanticscholar   +1 more source

6-Trifluoromethanesulfonyloxy-4(3H)-pyrimidinones as versatile intermediates for the synthesis of 6-functionalized 4(3H)-pyrimidinones

Tetrahedron Letters, 1997
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Ping Zhou, Edward C. Taylor, Colin M. Tice   +2 more
openaire   +3 more sources

A simple approach for the regioselective synthesis of imidazo[1,2-a]pyrimidiones and pyrimido[1,2-a]pyrimidinones

Tetrahedron, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
David Font, Anthony Linden, José M. Villalgordo, Montserrat Heras   +3 more
openaire   +3 more sources

A metal-free tandem approach to prepare structurally diverse N-heterocycles: synthesis of 1,2,4-oxadiazoles and pyrimidinones

, 2014
A metal-free one-pot approach to the diversity oriented synthesis of N-heterocycles, 1,2,4-oxadiazoles and 2,6 disubstituted pyrimidin-4-ones is described via carboxamidation of amidines with aryl carboxylic acids and aryl propargylic acids.
Puneet Gupta, M. K. Hussain, M. Asad, R. Kant, Rohit Mahar, Sanjeev K. Shukla, K. Hajela   +6 more
semanticscholar   +1 more source

Synthesis of 6‐cyanopyrido[2,3‐d]pyrimidinones in the reaction of 6‐amino‐4‐pyrimidinones with arylidene derivatives of malonodinitrile

Journal of Heterocyclic Chemistry, 1998
AbstractThis paper describes the synthesis of a new series of 7‐amino‐5‐aryl‐6‐cyano‐5,8‐dihydropyrido‐[2,3‐d]pyrimidin‐4(3H)‐ones 3 from the reaction of 6‐amino‐4‐pyrimidinones 1 with arylidene derivatives of malonodinitrile 2. The structure of the final compounds was determined on the basis of nmr measurements, especially by 1H, 1H‐, 1H, 13C COSY ...
Manuel Nogueras, Adolfo Sánchez, Jairo Quiroga, Braulio Insuasty, Mario Alvarado, Justo Cobo   +5 more
openaire   +3 more sources

An Unusual Condensation of Pyrimidinones: Synthesis of Bipyrimidinones and Bipyrimidinylmethane

HETEROCYCLES, 1991
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
BOTTA M, SALADINO R, GAMBACORTA, Augusto, NICOLETTI R.   +3 more
openaire   +4 more sources

Ligand‐free CuI‐catalyzed coupling and cyclization of β‐bromo‐α,β‐unsaturated amides with formamide leading to pyrimidinones

, 2013
β-Bromo-α,β-unsaturated amides were coupled and cyclized with formamide in DMF at 100°C in the presence of a catalytic amount of a copper(I) salt along with a base to give the corresponding pyrimidinones in good yields. Copyright © 2013 John Wiley & Sons,
S. Ho, C. Cho
semanticscholar   +1 more source

Synthesis of Biologically Active 6-(Tolylhydrazinylidene)Pyrazolo[1,5-a]Pyrimidinones

Chemistry of Heterocyclic Compounds, 2020
Y. Burgart, N. A. Elkina, E. Shchegolkov, O. Krasnykh, V. Maslova, G. Triandafilova, S. Solodnikov, G. Makhaeva, O. Serebryakova, E. Rudakova, V. Saloutin   +10 more
semanticscholar   +1 more source

Mn(OAc)3-Mediated Selective Free Radical Phosphonylation of Pyridinones and Pyrimidinones

, 2013
The phosphonyl radical generated from the reaction of dimethyl phosphite with manganese(III) acetate adds selectively to the 3-position of pyridin-2-ones or the 5-position of pyrimidin-4-ones to afford phosphonylated products in good yields.
Wang-Bin Sun, Yun-Fei Ji, Xiangqiang Pan, Shaofang Zhou, J. Zou, Wei Zhang, O. Asekun   +6 more
semanticscholar   +1 more source

Microwave-Facilitated Synthesis of Pyrimidinones

Synfacts, 2011
M. Radi, M. Botta, G. Casaluce
openaire   +2 more sources