K. Suresh Kumar

PEG-SO3H catalyzed synthesis and cytotoxicity of α-aminophosphonates

One pot three-component PEG-SO(3)H catalyzed reaction of 4-(Pyridin-4-yl)benzaldehyde and triethyl phosphite with various primary amines afforded α-aminophosphonates with high yields by the Kabachnik-Fields reaction. These new structurally diversified set of α-aminophosphonates (4a-j) were evaluated for their anti-tumor activity on human chronic myeloid leukemia cells (K 562), human colon carcinoma cells (Colo 205) along with non-cancerous human embryonic kidney cells (HEK 293). They showed moderate activity on both cancerous cells and non-cancerous cells.

Solvent-free synthesis of novel 2,10-dichoro-12-trichloromethyl-6-substituted xanthato-12H-dibenzo[d,g] [1,3,2] dioxaphosphocin-6-sulfides

Abstract 2,10-Dichloro-12-trichloromethyl-6-substituted xanthato-12H-dibenzo[d,g] [1,3,2] dioxaphosphocin-6-sulfides (2a–l) with the eight-membered phosphorus and oxygen heterocyclic ring were synthesized by reacting equimolar quantities of alcohols, carbon disulfide, and 2,6,10-trichloromethyl-12H-dibenzo[d,g][1,3,2] dioxaphosphocin-6-sulfide 1 in the presence of dimethylaminopyridine (DMAP). The structures of the products were confirmed by IR, 1H, 13C, 31P-NMR, and mass spectral analyses.