Abstract
Several derivatives of the novel benzo[b]pyrazolo[5′,1′:2,3]pyrimido[4,5‐e][1,4]thiazine ring system have been synthesized through the one‐pot cyclocondensation of 6‐bromo‐7‐chloro‐2‐(ethylthio)‐5‐methylpyrazolo[1,5‐a]pyrimidine‐3‐carbonitrile (4) with o‐aminothiophenol in the presence of Et3N in CH3CN. The true regio isomer (5) was also determined by X‐ray crystallographic analysis. The N‐alkylation of the synthesized compound (5) was also accomplished.
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