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Title: A one-step synthesis of 5,7-diaryl-1,5-dihydro (or 1,2,3,5-tetrahydro)-pyrano [2,3-<i>d</i>]pyrimidin-2,4-diones (or 2-thioxo-4-ones)
Authors: Ahmed, M Giasuddin
Romman, U K R
Akhter, Kawsari
Halim, Md Ershad
Rahman, Md Mahbubur
Ahmed, S Mosaddeq
Issue Date: Jul-2011
Publisher: NISCAIR-CSIR, India
Abstract: A one-step synthesis of 5,7-diaryl-1,5-dihydro-pyrano[2,3-<i>d</i>]pyrimidin-2,4-diones, <b style="">3a-c</b> and 5,7-diaryl-2-thioxo-1,2,3,5-tetra¬≠hydropyrano[2,3-<i>d</i>]pyrimidin-4-ones, <b style="">3d-g</b> has been achieved by the cyclocondensation of barbituric acid or thiobarbituric acid <b style="">1</b> with arylideneacetophenones, <b style="">2a-d</b> in glacial acetic acid in the presence of phosphorous pentoxide. The structures of the compounds <b style="">3a-g</b> have been determined by their UV, IR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, mass spectral data and elemental analyses.
Description: 946-948
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.50B(07) [July 2011]

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