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Synthesis 1989; 1989(8): 618-621
DOI: 10.1055/s-1989-27336
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Studies on the Synthesis of Phosphorus Heterocycles I. [1,4,3]Thiazaphosphorino[3,4-b][1,3,2]benzodiazaphosphorine 12-Oxides

Ruyu Chen* , Rong Bao
  • *Institute of Elementoorganic Chemistry, Nankai University, Tianjin, People's Republic of China
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Publication Date:
17 September 2002 (online)

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N-Substituted isatoic anhydrides 4 react with 2-bromoethylamino hydrobromide in the presence of triethylamine to form oxazolines 6, which are treated with phosphorus trichloride to give a key intermediate 7. Reaction of 7 with phenyl isothiocyanate yields fused phosphorus heterocycles 9. Several methods for preparing compounds 9 and the mechanism of cyclization are discussed.