Solvent-free regioselective synthesis of 6-and 7-substituted pteridines under microwave irradiation
作者:R. Singh、Geetanjali
DOI:10.1134/s1070428006010210
日期:2006.1
Reactions of 5,6-diaminouracils with a-keto aldehydes over acidic and neutral aluminum oxide under microwave irradiation gave the corresponding 6- and 7-substituted 1,2,3,4-tetrahydropteridine-2,4-diones in 63-79% yield with high regioselectivity.
Pteridine Chemistry. II. The Action of Excess Nitrous Acid Upon Pteroylglutamic Acid and Derivatives
作者:Robert B. Angier、James H. Boothe、John H. Mowat、Coy W. Waller、Joseph Semb
DOI:10.1021/ja01122a036
日期:1952.1
One-Step Synthesis of Lumazine and Xanthine: First Co-Crystal of Lumazine and Perchloric Acid with a Unique Monohydrated Hydronium Ion (H5O2+) Mediated Supramolecular Assembly of the Lumazine Dimer
作者:Shyamaprosad Goswami、Annada C. Maity、Hoong-Kun Fun
DOI:10.1002/ejoc.200700271
日期:2007.8
A perchloricacidmediatedone-stepsynthesis of lumazine derivatives from pterins and xanthine from guanine is reported. However, 2-pivaloylamino derivatives of pterins underwent simple hydrolysis of the pivaloylamino group generating free pterin compounds, but the 2-oxo derivatives, that is, the lumazine compounds, were not obtained. A novel supramolecularassembly is constructed by the unique hydrogen