Abstract
The title compounds, spiro[1,3-dioxolane-2,3'-indolin]-2'-one, was synthesized with isatin and 2-chloroethanol by a intramolecular substitution reaction in the presence of K(2)CO(3) for the first time, which avoided the using of H(+) as catalyst in traditional synthesis of ketal compounds. The structure of spiro[1,3-dioxolane-2,3'-indolin]-2'-one was studied by X-ray single crystal diffraction, and the two byproducts in the reaction were characterized by H(1)-NMR, MS spectrums. With these results, the proposed way to spiro[1,3-dioxolane-2,3'-indolin]-2'-one and the two byproducts was brought forward.
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