期刊
MONATSHEFTE FUR CHEMIE
卷 138, 期 7, 页码 663-667出版社
SPRINGER WIEN
DOI: 10.1007/s00706-007-0655-9
关键词
benzoxazoles; benzothiazoles; benzimidazoles; oxazolo[4,5-b]pyridines; Bi(III) salts
A series of benzoxazoles, benzothiazoles, benzimidazoles, and oxazolo[4,5-b]pyridines was efficiently synthesized from the reactions of o-aminophenols, o-aminothiophenol, o-phenylenediamines, and 2-amino-3-hydroxypyridine with orthoesters in the presence of catalytic amounts of Bi(III) salts, such as Bi(TFA)(3), Bi(OTf)(3), and BiOClO4 (.) xH(2)O under solvent-free conditions. The remarkable features of this new protocol are high conversion, very short reaction times, cleaner reaction profiles under solvent-free conditions, straightforward procedure, and use of relatively non-toxic catalysts.
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