thiazoles, triazoles, tetrazoles, hydrazines and hydrazinecarboxamides in good to high yields. This reaction catalyzed by ferric hydrogensulfate as a heterogeneous acid catalyst in ethanol through S N 1 type reaction of pyrylium with a nucleophilic reagent afforded the heterocycle- and aromatic- N -substituted xanthene derivatives as simple marked molecules in short reaction times.
摘要我们证明了用不同的亲核试剂如噻唑,三唑,四唑,肼和肼甲酰胺直接或高效地取代了9 H -xanthen-9-ol。通过硫酸氢盐作为乙醇中的多相酸催化剂,通过吡啶鎓与亲核试剂的SN 1型反应,催化该反应,从而在较短的反应时间内提供了杂环和芳香族N-取代的x吨衍生物,作为简单的标记分子。