Synthesis and Characterization of Novel (E)-1-(Hexa-3,5-dien-1-yl)-4-methoxybenzene via Boronate Complex
作者:Habib Hussain、Syeda Rubina Gilani、Zulfiqar Ali、Hajira Rehman、Imdad Hussain
DOI:10.14233/ajchem.2014.17095
日期:——
Novel (E)-1-(hexa-3,5-dien-1-yl)-4-methoxybenzene was synthesized through boronate complex. 3-(4-Methoxyphenyl)propyl diisopropylcarbamate was reacted with allylboronic acid pinacol ester in the presence of N,N,N,N-tetramethylethyllenediamine to give secondary boronic ester which was further reacted with (vinylsulfonyl)benzene by using Grubbs Hoveyda II. Resulting product (E)-2-(1-(4-methoxyphenyl)-6-(phenylsulfonyl)hex-5-en-3-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane was then treated with 1-bromo-3,5-bis(trifluoromethyl)benzene in the presence of n-BuLi to get nucleophilic boronate complex. (E)-1-(hexa-3,5-dien-1-yl)-4-methoxybenzene was obtained in excellent yields by stirring boronate complex at 50 °C for 1 h and refluxing for 15 h.
通过硼酸盐复合物合成了新型化合物(E)-1-(己-3,5-二烯-1-基)-4-甲氧基苯。首先,3-(4-甲氧基苯基)丙基二异丙基氨基甲酸酯与双(2-甲基丙基)氨基硼酸频哪醇酯在N,N,N,N-四甲基乙二胺的存在下反应生成二级硼酸酯,随后在Grubbs Hoveyda II催化剂的作用下与(乙烯砜基)苯反应。所得产物(E)-2-(1-(4-甲氧基苯基)-6-(苯基砜基)己-5-烯-3-基)-4,4,5,5-四甲基-1,3,2-二氧硼杂环戊烷接着与1-溴-3,5-双(三氟甲基)苯在n-BuLi的存在下反应,生成亲核性硼酸盐复合物。最后,通过将硼酸盐复合物在50°C下搅拌1小时并回流15小时,以优异的产率获得了目标化合物(E)-1-(己-3,5-二烯-1-基)-4-甲氧基苯。