Abstract
The title compound 2a was synthesized by a four-step sequence starting from 4,5-dichlorofurazano[3,4-b]pyrazine 3; the key step being a one-pot transformation of tetrazolo sulfilimine 6 to 2a via an oxidation/tetrazole ring cleavage/nitrogen loss/ring-closure/ proton trapping procedure.
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While the paper was in the press another method of 2a synthesis had been published, see: I. B. Starchenkov and V. G. Andrianov, Khim. Geterotsikl. Soedin., 1996, 717 (in Russian).