Ring transformations of heterocyclic compounds.<b>XV</b>.<i>N</i>-(2-hydroxyphenyl) substituted 2-alkylamino-4,6-diarylbenzophenones by ring transformation of 2,4,6-triarylpyrylium salts with anhydrobases of benzoxazolium salts
作者:Thomas Zimmermann、Ulrich Abram、Klaus Schmidt
DOI:10.1002/jhet.5570330621
日期:1996.11
6-triarylpyrylium salts1 and 3-alkyl-2-methylbenzoxazolium salts 2 in the presence of triethylamine in ethanol by a 2,5-[C4+C2] pyryliumring transformation is reported. Structure elucidation is performed by an X-ray crystalstructure determination of the benzophenone 3a. Spectroscopic data of the transformation products and their mode of formation via anhydrobases of the salts 2 are discussed.