Synthesis of 2,5-Diaryl-3-halofurans via Regioselective Ring Cleavage of Aryl 3-Aryl-2,2-dihalocyclopropyl Ketones
作者:Yoo Tanabe、Ken-ichi Wakimura、Yoshinori Nishii、Yukari Muroya
DOI:10.1055/s-1996-4218
日期:1996.3
Several aryl 3-aryl-2,2-dihalocyclopropyl ketones were converted to 2,5-diaryl-3-halofurans in the presence of aluminum chloride via regioselective gem-dihalocyclopropane ring cleavage. Friedel-Crafts acylation of substituted benzenes with 3-aryl-2,2-dihalocyclopropanecarbonyl chlorides followed by this furan formation also proceeded in a one-pot manner. For functionalization, bromine on a furan ring was easily replaced by methyl and carboxyl groups; lithiation using butyllithium followed by the treatment with iodomethane and carbon dioxide, respectively.
在有氯化铝存在的情况下,通过区域选择性的宝石-二环丙烷环裂解,一些芳基 3-芳基-2,2-二环丙基酮被转化为 2,5-二芳基-3-卤呋喃。用 3-芳基-2,2-二卤代环丙烷羰酰氯对取代苯进行弗里德尔-卡夫酰化,然后形成呋喃,也是以一锅法进行的。在官能化方面,呋喃环上的溴很容易被甲基和羧基取代;使用丁基锂进行锂化,然后分别用碘甲烷和二氧化碳进行处理。