New compounds: organoboron derivatives of tetracyclines I: synthesis of carboxamido derivative of tetracycline with perhydro-2-phenyl-1,3,6,2-dioxazaborocine. 
An organoboron carboxamido derivative of tetracycline, designed for use in the 105B-thermal neutron-capture treatment of cancer, was synthesized under the conditions of the Mannich reaction using perhydro-2-phenyl-1,3,6,2-dioxazaborocine as the amine component.  Spectral data (UV, IR, and NMR) for the compound and its hydrolytic stability are discussed.