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.
9- 苯基二
氧杂蒽 10-氧化物(1)与多种
格氏试剂反应,可得到 9-取代的 9-苯基二
氧杂蒽(2)。同样,
有机锂与亚砜 1 反应,得到相应的
硫代杂
蒽 2。通过酸催化环化三芳基
甲醇衍
生物 5 来合成样品,证实了 9-芳基-9-苯基
硫代杂
蒽 (2d-i) 的结构。通过 9-苯基
硫氧杂蒽离子中间体,提出了亚砜 1 与有机
金属试剂反应的可能机理。