中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-(4-溴苯基)-1-(4-甲氧基苯基)乙酮 | 2-(4-bromophenyl)-1-(4-methoxyphenyl)-1-ethanone | 67205-73-6 | C15H13BrO2 | 305.171 |
2-(4-甲氧基苯基)-2-氧代乙醛 | p-methoxyphenylglyoxal | 1076-95-5 | C9H8O3 | 164.161 |
—— | 1-(4-bromophenyl)-3-(4-methoxyphenyl)propan-1,3-dione | 37975-18-1 | C16H13BrO3 | 333.181 |
A series of highly reactive cyclopentadienones were prepared in situ from the corresponding hydroxycyclopent-2-enones and trapped with a variety of quinones. Reaction of 1,4-naphthoquinone with 4-hydroxy-3,4-diphenyl-cyclopent-2-enone afforded 2,3-diphenylanthraquinone, whereas reaction of benzoquinone with this same cyclopentadienone precursor yielded a mixture of 6,7-diphenyl-1,4-naphthoquinone and 2,3,6,7-tetraphenyl anthraquinone. A number of other 2,3-diarylanthraquinones were likewise prepared in moderate yields from the reaction of 1,4-naphthoquinone with the appropriate 4-hydroxy-3,4-diarylcyclopent-2-enones. This method appears to be generally applicable to the synthesis of anthraquinone derivatives substituted at the 2- and 3-positions from inexpensive starting materials.Key words: anthraquinone, DielsAlder, cyclopentadienone, in situ.