Reactions of 9-Phenylthioxanthene 10-Oxide with Organometallic Reagents.
作者:Hiroshi SHIMIZU、Tadashi KATAOKA、Mikio HORI
DOI:10.1248/cpb.41.842
日期:——
Reaction of 9-phenylthioxanthene 10-oxide (1) with a variety of Grignard reagents afforded 9-substituted 9-phenylthioxanthenes (2). Similarly, organolithiums reacted with the sulfoxide 1 to give the corresponding thioxanthenes 2. The structures of 9-aryl-9-phenylthioxanthenes (2d-i) were confirmed by the alternative synthesis of the samples via the acid-catalyzed cyclization of triarylmethanol derivatives 5. A possible mechanism by way of a 9-phenylthioxanthylium ion intermediate is proposed for the reaction of the sulfoxide 1 with organometallic reagents.
Synthesis of tetraarylmethanes via a Friedel-Crafts cyclization/desulfurization strategy
作者:Paul J. Griffin、Matthew A. Fava、St. John T. Whittaker、Kristopher J. Kolonko、Arthur J. Catino
DOI:10.1016/j.tetlet.2018.09.056
日期:2018.11
Despite their importance, there are only a few methods available for their preparation. Herein, we report a simple procedure for the preparation of tetraarylmethanes that involves a bismuth-catalyzed Friedel-Crafts cyclization followed by a desulfurization reaction mediated by Raney nickel.
Reactivities of heteroaromatic cations containing a Group VIB element in nucleophilic reactions. Reactions of 9-phenyl-xanthylium, -thioxanthylium, and -selenoxanthylium salts with amines, sodium phenolate, and sodium benzenethiolate
作者:Mikio Hori、Tadashi Kataoka、Hiroshi Shimizu、Chen Fu Hsu、Yukio Hasegawa、Noriko Eyama
DOI:10.1039/p19880002271
日期:——
Reactions of 9-phenylchalcogenoxanthylium salts (1a–c) with some nucleophiles have been examined in order to find the differences in reactivity in nucleophilicreactions. The chalcogenoxanthylium salts (1a–c) react with aniline in ether to give 9-anilino-9-phenylchalcogenoxanthenes (7a–c). However, in acetonitrile the xanthylium salt (1a) affords N,4-bis(9-phenylxanthen-9-yl)aniline (9a) together with