10-Hydroxy-10,9-boroxarophenanthrenes: Versatile Synthetic Intermediates to 3,4-Benzocoumarins and Triaryls
作者:Q. Jean Zhou、Karin Worm、Roland E. Dolle
DOI:10.1021/jo049343w
日期:2004.7.1
proceeds via intramolecular electrophilic aromatic cyclization of a reactive dibromoaryloxyborane intermediate. Essentially quantitative yields of 10-hydroxy-10,9-boroxarophenanthrenes were also obtained from 2-hydroxybiaryl and BCl3/AlCl3 with use of a modified literature procedure. As synthetic intermediates, 10-hydroxy-10,9-boroxarophenanthrenes were efficiently converted to 3,4-benzocoumarins and triaryls
在BBr 3介导的2-甲氧基联芳基的O-去甲基化作用下,获得了作为预料不到的主要产物的10-羟基-10,9-环杂芳基菲。该形成可能通过反应性二溴芳基氧基硼烷中间体的分子内亲电芳族环化而进行。使用改良的文献方法,还从2-羟基联芳基和BCl 3 / AlCl 3获得了基本定量的10-羟基-10,9-环硼氧杂菲的产率。作为合成中间体,通过Pd催化的CO插入和Suzuki反应,可将10-羟基-10,9-硼氧杂菲并有效地转化为3,4-苯并香豆素和三芳基。