The reaction of arylphospholes 1a–c with phosphorustribromide followed by treatment with morpholine afforded the 2- or 3-substituted species 3a,b or 7 (which after oxidation gave 4a,b or 8) in a selective manner.
The reaction of 1-(tri-tert-butylphenyl)phosphole (1) with phosphorus tribromide gave the 3-dibromophosphino intermediate (2) selectively that was useful in the synthesis of phosphonic amides 4, H-phosphinic amide 6 and H-phosphinates 8. A similar transformation of the 1-(triisopropylphenyl)phosphole (9) led to a 2-substitution furnishing phosphonic amides 12 or H-phosphinates 14. The phosphorylated