Synthesis of 4,6-Dimethyldibenzothiophene and 1,2,3,4-Tetrahydro-4,6-dimethyldibenzothiophene via Tilak Annulation
作者:Xiaoying Xu、Xiang Li、Anjie Wang、Yinyong Sun、W. Bernd Schweizer、Roel Prins
DOI:10.1002/hlca.201100191
日期:2011.10
1,2,3,4‐Tetrahydro‐4,6‐dimethyldibenzothiophene was prepared by coupling 2‐bromo‐3‐methylcyclohexanone with 2‐methylbenzenethiol and annulating the product with the aid of polyphosphoric acid. A mixture of 1,2,3,4‐tetrahydro‐4,6‐dimethyldibenzothiophene and 4,6‐dimethyldibenzothiophene was prepared by coupling 2‐bromo‐3‐methylcyclohex‐2‐en‐1‐one with 2‐methylbenzenethiol and annulating the product
1,2,3,4-四氢-4,6-二甲基二苯并噻吩的制备方法是将2-溴-3-3-甲基环己酮与2-甲基苯硫醇偶合,然后借助多磷酸对产物进行环化处理。1,2,3,4-四氢-4,6-二甲基二苯并噻吩和4,6-二甲基二苯并噻吩的混合物是通过将2-溴-3-甲基环己基-2-烯-1-酮与2-甲基苯硫酚偶联并环化而制得的产品借助多磷酸。通过溴化Me 3 Al到Cu-催化的2-Bromocyclohex-2-en-1-one和2-bromo-3-3-methylcyclohex-2-en-1-one中共轭合成Me 3 Al来合成2-Bromo-3-甲基环己酮。消除了3-methylcyclohex-2-en-1-one。1,2,3,4,4a,9b-六氢-4,6-二甲基二苯并噻吩是通过用Zn和CF 3 COOH还原1,2,3,4-四氢-4,6-二甲基二苯并噻吩制备的。