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

Abstract 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.