A Parham Cyclization route to the 2,3-dihydro 1H-indazole-1,2-dicarboxylate ring system via condensation of thermolabile aryllithium reagents and azodicarboxylate esters
Hunt, David A.
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The Parham Cyclization reaction of o-lithiobenzyl chlorides (generated by low temperature halogen-metal exchange of the corresponding o-bromobenzyl chlorides with n-butyllithium) with azodicarboxylate esters provides a new entry to the 2,3-dihydro-1H-indazole-1,2-dicarboxylate ring system in moderate to good yield.
Farrokh, J., Craven, T., & Hunt, D. (n.d.). A Parham Cyclization route to the 2,3-dihydro-1H-indazole-1,2-dicarboxylate ring systems via condensation of thermolabile aryllithium reagents and azodicarboxylate esters. Tetrahedron Letters, 58(19), 1900–1901.
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