作者:Gary W. Yeager、David N. Schissel
DOI:10.1055/s-1991-26381
日期:——
A convenient method for the preparation of 4-aryloxyphenols via the homologation of preformed phenols is described. Condensation of various 4-substituted phenols with either 4-fluorobenzaldehyde (8) or 4-fluoroacetophenone (9) yielded the corresponding 4-aryloxybenzaldehydes, 10, and acetophenones, 11, in 70-93 % yield. Baeyer-Villiger oxidation of these materials with 3-chloroperoxybenzoic acid (MCPBA) yielded the corresponding 4-formyloxy and 4-acetoxyphenyl ethers which were hydrolyzed without purification to the desired 4-aryloxyphenols 12 in 72-94 % yield. Both 4-fluorobenzaldehyde (8) and 4-fluoroacetophenone (9) are synthetically equivalent to the a4 umpoled synthon 6. Extension of this methodology of the preparation of 4,4′-[arylbis(oxy)]bisphenols from aromatic diols is also described. Condensation of various aromatic diols with 8 or 9 yielded the corresponding 4,4′[arylbis(oxy)]bisbenzaldehydes 15 and acetophenones 16 in 71-89 % yield. Baeyer-Villiger oxidation of these compounds with MCPBA yielded the desired 4,4′-[arylbis(oxy)]bisphenyl bisformates 17 and bisacetates 18 in 67-84 % yield. Hydrolysis of these compounds afforded the desired 4,4′-[arylbis(oxy)]bisphenols 19 in 70-91% yield.
本文介绍了一种通过预成苯酚的同系物制备 4-芳氧基苯酚的简便方法。将各种 4-取代苯酚与 4-氟苯甲醛 (8) 或 4-氟苯乙酮 (9) 缩合,可得到相应的 4-芳氧基苯甲醛 10 和苯乙酮 11,收率为 70-93%。用 3-氯过氧苯甲酸(MCPBA)对这些材料进行拜耳-维里格氧化,可得到相应的 4-甲氧基和 4-乙酰氧基苯基醚,这些醚无需纯化即可水解为所需的 4-芳氧基苯酚 12,收率为 72-94%。 4-氟苯甲醛(8)和 4-氟苯乙酮(9)在合成上等同于 a4 umpoled 合成物 6。此外,还介绍了从芳香族二元醇制备 4,4′-[芳基双(氧)]双酚的方法的扩展。将各种芳香族二元醇与 8 或 9 缩合,可得到相应的 4,4′-[芳基双(氧)]双苯甲醚 15 和苯乙酮 16,收率为 71-89%。用 MCPBA 对这些化合物进行 Baeyer-Villiger 氧化,可得到所需的 4,4′-[芳基双(氧)]双苯双甲酸酯 17 和双乙酸酯 18,收率为 67-84%。水解这些化合物可得到所需的 4,4′-[芳基双(氧)]双酚 19,收率为 70-91%。