3,3-Disubstituted 1,5-diaryl-1,5-pentanediones as versatile intermediates for spiro heterocycles

摘要

The spiro heterocycles, spiro-4H-pyran pyrazolidinedione/isoxazolidinedione/pyrimidinetrione/thioxopyrimidinedione and spiro-4H-pyran aminopyrazolidinone/isoxazolidinone/hydroxypyrimidinone/mercaptopyrimidinone have been prepared from 3,3-disubstituted 1,5-diaryl-1,5-pentanedione. All the compounds have been characterised by spectral parameters.