Studies on the synthesis of borazines from borane and 1,2-aminoalcohols

Polycyclic borazines with three adjacent 1,3,2-oxazaborolidine rings were efficiently synthesized by the reaction of 1,2-aminoalcohols or 1,2-aminophenol with borane at room temperature and subsequent cyclization of the intermediate above 120 °C. The X-ray structure of borazine derived from norephedrine indicates an almost planar central aromatic borazine structure condensed with the oxazaborolidine rings and the phenyl and methyl groups at one side of the plane.