Synthesis of 1-Tosyl-4,6-dihydrothieno[3,4-d]pyrazole 5,5-Dioxides as Precursors to Pyrazole Analogue of o-Quinodimethane |
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| Authors: | Hsi-Hwa Tso Yu-Ming Chang Hongru Tsay |
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| Institution: | Institute of Chemistry, Academia Sinica Nankang , Taipei, 115, Taiwan, Republic of China |
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| Abstract: | A facile synthesis of 3-substituted 1-tosyl-4,6-dihydrothieno3,4-d]pyrazole 5,5-dioxides from readily prepared 3-(phenylthio)-4-acyl-3-sulfolenes and their use as precursors to o-dimethylene pyrazole in 4 + 2] cycloaddition are described. |
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