Synthesis and crystal structure determination of methyl 2-acetyl-5′-phenyl-2H-spiro[benzo[d]isothiazole-3,3′-pyrazole]-1, 1-dioxide-2′(4′H)-carboxylate and Methyl 2-acetyl-5′-(2- thienyl)-2H-spiro[benzo[d]isothiazole-3,3′-pyrazole]-1, 1-dioxide-2′(4′H)-ca

Article abstract of DOI:10.1007/s10870-009-9649-2

Dilithiated C(α), N-carbomethoxyhydrazones were condensed with lithiated methyl 2-(aminosulfonyl)benzoate to afford intermediates that were isolated and not characterized but cyclized with acetic anhydride, which also resulted in N-acetylation. The X-ray