Biphenyl lignans are rare compounds that exhibit a broad range of biological activities. The first total synthesis of natural biphenyl ether lignan, 3-methylobovatol, has been achieved in four steps. This synthesis allows for modification of the C-2 phenol and in doing so, will facilitate various structure-activity relationship studies into these bioactive compounds.
4,4-Dibromo-3-methylpyrazol-5-one: New applications for selective monobromination of phenols and oxidation of sulfides to sulfoxides
摘要:
Dibromopyrazolone 1, a stable, crystalline solid effects pare selective monobromination of phenols and aniline substrates under mild conditions. Selective oxidation of sulfides to sulfoxides can also be accomplished by using 1 in high yields. (C) 1997 Published by Elsevier Science Ltd.
The microwave-accelerated Claisen rearrangement of allyl aryl ethers was investigated, in order to gain insight into the scope of the catalysts, solvents, temperatures, and substrates. Among the catalysts examined, phosphomolybdic acid (PMA) was found to greatly accelerate the reaction in NMP, at temperatures ranging from 220 to 300 °C. This method was found to be useful for preparing several intermediates
A practical highly selective oxybromination of phenols with dioxygen
作者:Luciano Menini、Luciana A. Parreira、Elena V. Gusevskaya
DOI:10.1016/j.tetlet.2007.06.093
日期:2007.9
A simple, low cost and highly selective method for the synthesis of mono-bromophenols from phenol and electron-rich phenolic compounds has been developed. Bromide ions are used as halogenating agents, dioxygen as a final oxidant, and Cu(OAc)(2) as a catalyst. (C) 2007 Elsevier Ltd. All rights reserved.
Potential Antimicrobial Agents. Bromo Compounds of Eugenol
作者:Noël J. de Souza、A. N. Kothare、V. V. Nadkarny
DOI:10.1021/jm00322a045
日期:1966.7
Nishiyama, Atsuko; Eto, Hideo; Terada, Yukimasa, Chemical and pharmaceutical bulletin, 1983, vol. 31, # 8, p. 2820 - 2833