HETEROCYCLES

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■ The Reaction of Electron Excess Aromatic Heterocycle, 1,4-Dihydropyrrolo[3,2-b]pyrrole and Some Related Compounds with Chlorosulfonyl Isocyanate (CSI)

Kyosuke Satake, Kentaro Yano, Makoto Fujiwara, and Masaru Kimura

*Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan

Abstract

The reaction of 3,6-di-tert-butyl-1,4-dihydropyrrolo[3,2-b]pyrrole and its N,N’-dimethoxycarbonyl derivative with chlorosulfonyl isocyanate (CSI) was investigated. The higher reactivity for the electrophilic reaction and a remarkable electron excessiveness of the system were demonstrated by comparing with those of indole and pyrrole derivatives.