描述了九种异构的甲基取代的对苯二甲苯的合成。使用了三种不同的方法。通过对苯二酚(2)和4,5,7,8,9,10-六氢对苯二甲酸(17)的甲酰化反应制得1-,2-和6-甲基对苯二甲苯(1a,1c和1f)),然后进行Wolff-Kishner还原和脱氢反应。通过用甲基锂处理相应的苯乙酮,然后进行脱水,然后脱水,在1g和1j的情况下进行脱氢,从而合成4-,5-,7-和10-甲基对苯二甲苯(1d,1e,1g和1j)。通过Haworth合成,从甲基琥珀酸酐与的反应开始,制备8-和9-甲基苯并菲(1h和1i)。通过质谱,1 H NMR和UV-VIS光谱研究了对苯乙撑及其甲基衍生物的光谱性质。根据1 H NMR光谱,甲基和附近质子之间的空间位阻按以下顺序减小:1、10> 6> 7> 3> 4、5、8、9。
Tandem Oxidative Ring-Opening/Cyclization Reaction in Seconds in Open Atmosphere for the Synthesis of 1-Tetralones in Water–Acetonitrile
作者:Jingxian Fang、Lesong Li、Chu Yang、Jinping Chen、Guo-Jun Deng、Hang Gong
DOI:10.1021/acs.orglett.8b03246
日期:2018.11.16
A mild and practical tandem oxidative ring-opening/cyclization reaction mediated by Ce4+ for the synthesis of 1-tetralones is presented. This rapid transformation was completed within 30 s and conducted in an open reactor at 0 °C in a water–acetonitrile mixture. Various cyclobutanol derivatives are transformed into desired products in good to high yields, and this reaction can be easily scaled up to