Synthesis and NMR properties of derivatives of 5,6-dihydroborauracil and 5,6-dihydroborathymine.

Novel boron compounds, a series of 4-hydroxy-5,6-dihydroborauracil and 4-hydroxy-5,6-dihydroborathymine derivatives containing various substituents at 3-, 5- and 6-positions, is presented. The spectroscopic properties, along with analyses of NMR-controlled boron compound-alcohol and boron compound-amine interactions, proves the existence of sp(3)-hybridized, stable B,B-bis-methoxy-5,6-dihydroborauracils and pyridine-/n-butylamine-5,6-dihydroborauracils ate-complexes in solution.