Synthesis of novel 3-phenyl-2-oxido/sulfido-1,3,4,2-benzoxadiazaphosphepines |
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| Authors: | Tarik E Ali Mohammed A Assiri I S Yahia |
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| Institution: | 1. Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt;2. Advanced Materials and Green Chemistry, Chemistry Department, Faculty of Science, King Khalid University, Abha, Saudi Arabia;3. Research Center for Advanced Materials Science, King Khalid University, Abha, Saudi Arabia;4. Advanced Functional Materials &5. Optoelectronic Laboratory, Department of Physics, Faculty of Science, King Khalid University, Abha, Saudi Arabia;6. Nanoscience Laboratory for Environmental and Bio-medical Applications, Semiconductor Lab., Department of Physics, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt |
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| Abstract: | An efficient and facile synthetic approach towards a series of novel 3-phenyl-2-oxido/sulfido-2,3-dihydro-1,3,4,2-benzoxadiazaphosphepines 2–7 was described. The method depended on the cyclocondensation of equimolar ratios of salicylaldehyde phenylhydrazone (1) with different examples of phosphorus halides and phosphorus sulfides in toluene containing triethylamine as a catalyst. In the same manner, the fusion of salicylaldehyde phenylhydrazone (1) with triethyl phosphate in the presence of DBU afforded the 2-ethoxy-1,3,4,2-benzoxa-diazaphosphepine 8, while a fusion of compound 1 with diethyl phosphite and tris(2-chloroethyl)phosphite led to the formation of new examples of 1,2-benzoxaphospholes 9 and 10, respectively. Interestingly, the reaction of compound 1 with diethyl ethoxycarbonyl phosphonate in ethanol containing DBU as a catalyst furnished the chromeno3,4-d]1,2,3]diazaphosphole derivative 12 as a regioselective product. |
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| Keywords: | 1 3 4 2-Benzoxadiazaphosphepine 1 2-benzoxaphosphole 1 2 3-diazaphosphole salicylaldehyde phenylhydrazone |
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