Cascade regioselective synthesis of pyrazoles from nitroallylic acetates and N-tosyl hydrazine
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Add time:09/27/2019 Source:sciencedirect.com
A simple, practical, and regioselective synthetic protocol for the formation of pyrazoles was developed. Unlike all other previously reported reactions of nitroallylic acetates, this process was initiated by a SN2 reaction at the electrophilic γ site. A plausible mechanism for the cascade SN2-Michael synthesis is proposed.
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