caa a22 4500 445878584 CHVBK 20180317145535.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s11030-010-9293-y doi (NATIONALLICENCE)springer-10.1007/s11030-010-9293-y Unexpected deviation from diene behaviour of uracil amidine: towards synthesis of some pyrido[2,3- d ]pyrimidine derivatives [Elektronische Daten] [Rupam Sarma, Kalyan Borah, Yuvaraj Dommaraju, Dipak Prajapati] Condensation products obtained from the treatment of uracil amidine with preformed or in situ generated suitably substituted olefins unexpectedly undergo intramolecular cyclisation during silica gel chromatography to generate pyrido[2,3-d]pyrimidines. Various reaction conditions are studied and the altered nature of the uracil amidine molecule is further explored by reacting it with different suitably substituted alkenes. Springer Science+Business Media B.V., 2010 Cycloaddition reaction nationallicence Heterocycles nationallicence Silica gel nationallicence Pyridopyrimidines nationallicence Sarma Rupam Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut Borah Kalyan Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut Dommaraju Yuvaraj Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut Prajapati Dipak Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut Molecular Diversity Springer Netherlands 15/3(2011-08-01), 697-705 1381-1991 15:3<697 2011 15 11030 https://doi.org/10.1007/s11030-010-9293-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11030-010-9293-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sarma Rupam Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Borah Kalyan Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Dommaraju Yuvaraj Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Prajapati Dipak Medicinal Chemistry Division, North East Institute of Science and Technology (CSIR), 785006, Jorhat, Assam, India aut NATIONALLICENCE 773 0- Molecular Diversity Springer Netherlands 15/3(2011-08-01), 697-705 1381-1991 15:3<697 2011 15 11030 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer