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MW-assisted treatment of oximinoacetanilides obtained from substituted primary aromatic amines was carried out in conc. H 2 SO 4 medium for 5-10 sec to give cyclic amides (isatins) through intramolecular cyclization by means of electrophilic aromatic substitution. Isatins reacted with thiosemicarbazide under MW-condition gave the corresponding Schiff-bases. The Schiff-bases undergo cyclization in presence of minimal Ac 2 O under MW-irradiation for 3-4 min to give the spiro -thiadiazoline acetyl derivatives in excellent yield. Keywords : Microwave-synthesis; Isatins; Schiff-base; spiro -Thiadiazoline; Green chemistry. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i2.3731 J. Sci. Res. 2 (2), 322-329 (2010)

Microwave-assisted Efficient Synthesis of Isatins and <i>spiro</i>-Thiadiazolines under Green Chemistry Protocol