Synthesis of 7,8,9,10,11,12,20,21,22,23,24,25-dodecahydrodibenzo[b,m]-[1,4,12,15]tetraoxacyclodocosin, a crown ether
作者:John H. P. Tyman、Jesse Grundy、George R. Brown
DOI:10.1039/p19810000336
日期:——
reduction to 7,8,9,10,11,12,20,21,22,23,24,25-dodecahydrodibenzo [b,m][1,4,12,15] tetraoxacyclodocosin ‘dibenzo-22-crown-4,’ proceeded smoothly. An unsymmetrical intermediate, methyl 4-(o-ethoxycarbonylmethoxypropylphenoxy) butyrate, was prepared for similar cyclisation and in preliminary experiments appeared to give acyloin and β-keto-ester products. The method represents a different approach to crown ether
从邻苯二酚合成了许多对称的二酯和非对称的二酯。在可以预期分子内形成酰基甘油的条件下,来自一种对称化合物4-(邻-乙氧基羰基丙氧基苯氧基)丁酸乙酯的产物是环状双-β-酮酯,从分子间狄克曼环化中获得合理的收率。水解为9,22二酮,并将其还原为7,8,9,10,11,12,20,21,22,23,24,25-十二烷基二苯并[ b,m ] [1,4,12,15 ]四氧环环十二烷“ dibenzo-22-crown-4”进展顺利。不对称中间体,甲基4-(o-乙氧基羰基甲氧基丙基苯氧基)丁酸酯被制备用于类似的环化反应,并且在初步实验中似乎产生了酰胆碱和β-酮酯产物。该方法代表了某些类型的冠醚系统的不同方法。