1‐Alkyl‐3‐trifluoromethylpyrazole‐4‐sulfonamides 10, (2‐trifluoromethyl‐2,3‐dihydrobenzimidazol‐2‐yl)methanesulfonamides 12, and (2‐benzimidazolyl)metbanesulfonamides 13 were prepared starting from 3,3,3‐trifluoro‐2,2‐dihydroxypropanesulfonamides 1.

ring closure reactions ring closure reactions O 0130 16 -061 3,3,3-Trifluoro-2,2-dihydroxypropanesulfonamides as Building Blocks for Trifluoromethyl-Containing Pyrazoles and Benzimidazoles. -The title compounds such as (V) and (VIII) are synthesized using the versatile synthons (I). -(TAKAHASHI, M.; MUTA, S.; NAKAZATO, H.; J. Heterocycl. Chem. 34 (1997) 5, 1395-1398 Dep. Mater. Sci., Fac. Eng., Ibaraki Univ., Hitachi, Ibaraki 316, Japan; EN)