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200517.fm Page 141 Friday, March 18, 2005 2:52 PM
2005
Benzothiazole derivatives
R 0270
Synthesis of 2-Arylbenzothiazoles and Imidazoles Using Scandium Triflate as a
for Both a Ring Closing and an Oxidation Steps. — A detailed study con17- 128 Catalyst
cerning the reaction of o-aminobenzenethiol (I) and aldehydes (II) in the presence of
oxygen shows that Sc(O-Tf)3 catalyzes two steps: formation of the thiazoline ring and
the following oxidation. The reaction is applied to o-phenylenediamine: improved
yields of the benzimidazoles (VI) are obtained by dilution of the reaction medium. —
(ITOH, T.; NAGATA, K.; ISHIKAWA, H.; OHSAWA*, A.; Heterocycles 63 (2004)
12, 2769-2783; Sch. Pharm. Sci., Showa Univ., Shinagawa, Tokyo 142, Japan; Eng.)
— Mais
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