REACTION OF 3-PHENYL-5-AMINOPYRAZOLE WITH CARBON-DISULFIDE - A NOVEL SYNTHESIS OF -(3'-PHENYLPYRAZOL-5'-YL)-4-PHENYLPYRAZOL-2-THIONE AS WELL AS OF PYRAZOLO[3,4-D]THIAZOLE AND PYRANO[2,3-D]THIAZOLE DERIVATIVES

3-Phenyl-5-aminopyrazole (1) reacts with carbon disulfide, followed by in situ reaction with alpha-halokerones 3a-c, to afford 5, 7a, and 7b , respectively. Compounds 5 and 7 were further utilized for the format ion of heterocycles and their fused derivatives.