Baliram N. Berad

A clean and efficient route was established to synthesize sulfonamido-thiocarbamides via one-pot reactions in aqueous medium without use of a catalyst and/or organic solvent. The reaction with stoichiometric molar portion could be carried out in an open atmosphere to offer sulfonamido-thocarbamides in good to excellent yields and purities. The novel and clean methodology offers the advantages including short reaction time, excellent yields, operational simplicity, less leaks and environmentally benign path. The identity of newly synthesized compounds is based on elemental and spectral data. They have been further screened for their microbiological activities.

An efficient synthesis of N-glucosylated 1, 2, 4-dithiazolidines from 1-arylidene-4-arylthiosemicarbazides and N-tetra-O-acetyl-β-D-glucopyranosylimino chloromethane sulphenyl chloride has been worked out. 1-Arylidene-4-arylthiosemicarbazides were synthesized by reacting different aryl/hetero aryl aldehydes/ketones with 4-arylthiosemicarbazides. The identities of new glucosylated heterocycles have been established on the basis of usual chemical transformation, IR, NMR and mass spectral studies. The final compounds were screened for biological activity against different bacterial strains.

H2O-mediated efficient, tandem synthesis of barbituryl thiocarbamides by the nucleophilic addition reaction of uramil and aryl isothiocyanates using Amberlyst-15 as a heterogeneous solid catalyst is being reported. The novel and clean methodology offers the advantages that includes short reaction time, good yields, and operational simplicity, less leaks, environmentally benign procedure apart from recyclable, reusable catalyst. Keywords; Thiocarbamides, green synthesis, Amberlyst-15.