Abstract 1,3‐Dipolar cycloadditions of C‐carboxymethyl‐N‐arylnitrile imines with substituted acetylenes bearing thiol or sulfone groups were studied. The sulfur controls the regiochemistry of the reaction, and this protocol was applied to the synthesis of ring‐fused thieno[2,3‐c]pyrazoles.
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Chandanshive et al. (2010) studied this question.
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