An Efficient Synthesis and Antibacterial Screening of Novel Oxazepine α-Aminophosphonates by Ultrasound Approach

An efficient synthesis of novel α-aminophosphonates by the reaction of quino[2,3-b][1,5]benzoxazepines with triethyl phosphite in the presence of the easily available, inexpensive, and nontoxic catalyst p-toluene sulphonic acid (p-TSA). This method affords the α-aminophosphonates under the influence of ultrasound irradiation in solvent-free conditions, in short reaction times (4–6 min), high yields (80–90%), with improved purity. The synthesized α-aminophosphonates show antibacterial activity against Gram-positive and Gram-negative bacteria. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.