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■ Preparation of Fused Thiadiazolo- and Imidazobenzothiazoles from 2-Amino-benzothiazoles. Their Fungicidal Acitivity

Yoo Tanabe,* Akiyuki Kawai, Yoshihiro Yoshida, Masahiro Ogura, and Hitomi Okumura

*School of Science, Kwansei Gakuin University, 1-1-155 Uegahara, Nishinomiya 662-8501, Japan

Abstract

A regioselective [2+3] cyclocondensation between chlorocarbonylsulfenyl chloride (3) and 2-aminobenzothiazoles gave 3H-1,2,4-thiadiazolo[3,4-b]benzothiazol-3-ones (1). Some heterocycles (1) and their isosteric known 5-substituted 2-methylimidazo[2,1-b]benzothiazoles (2) which were prepared from 2-aminobenzothiazoles via two steps, showed significant fungicidal activities.