Synthesis of 6-Substituted/Unsubstituted- 7,9-diaryl-1,2,4,8-tetraazaspiro[4.5]- decan-3-thiones

Abstract

Some 2,6-diarylpiperidin-4-one thiosemicarbazones (1a–8a), obtained from the corresponding 2,6-diarylpiperidin-4-ones (1–8) on oxidative cyclization with H₂O₂ at 0°C provide 7,9-diaryl-1,2,4,8-tetraaza spiro[4.5]decan-3-thiones (1b–8b) in excellent yields. The structures of these compounds have been established on the basis of their elemental, analytical and spectral data.

Acknowledgment

The authors are grateful to Dr. M. Vasudevan, JSS College of Pharmacy, Ooty, for his kind help in recording spectra and also to Prof. C. N. Krishnan, Head, Department of Chemistry, Annamalai University for providing needed facilities.