Synthesis of 1-Tosyl-4,6-dihydrothieno[3,4-d]pyrazole 5,5-Dioxides as Precursors to Pyrazole Analogue ofo-Quinodimethane
摘要:
A facile synthesis of 3-substituted 1-tosyl-4,6-dihydrothieno[3,4-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.