作者:A. Yu. Lyapunov、T. I. Kirichenko、E. Yu. Kulygina、N. G. Luk’yanenko
DOI:10.1007/s11178-005-0138-6
日期:2005.1
Alkylation of 2,7-dihydroxy-9H-fluoren-9-one with 2-(2-chloroethoxy)ethanol, 2-[2-(2-chloroethoxy)-ethoxy]ethanol, and 2-2-[2-(2-chloroethoxy)ethoxy]ethoxy}ethanol in dimethylformamide in the presence of potassium carbonate gave 78–80% of the corresponding diols which were treated with p-toluenesulfonyl chloride in a dioxanechloroform mixture in the presence of triethylamine at 0– 5°C (30 h). The resulting bis(p-toluene-sulfonates) were brought into condensation with 2,7-dihydroxy-9H-fluoren-9-one in a very dilute solution in dimethylformamide containing anhydrous potassium carbonate at 80–85°C. Appropriate treatment of the reaction mixture, followed by chromatographic purification afforded 53–27% of the first representatives of a new class of cyclophanes, bis(oxofluoreno)crownophanes. Raising the temperature to 95–105°C resulted in an appreciable decrease of the product yield. The yield of the target products did not increase on replacement of potassium carbonate by cesium carbonate.
将2,7-二羟基-9H-芴-9-酮与2-(2-氯乙氧基)乙醇、2-[2-(2-氯乙氧基)乙氧基]乙醇和2-2-[2-(2-氯乙氧基)乙氧基]乙氧基}乙醇在碳酸钾存在下的二甲基FORMAMIDE中进行烷基化,得到相应的二醇收率为78-80%。然后将这些二醇与对甲苯磺酰氯在含有三乙胺的二氧六环-氯仿混合溶液中在0-5°C反应30小时。得到的双(对甲苯磺酸盐)与在80-85°C条件下的含有无水碳酸钾的二甲基福尔马酮稀溶液中的2,7-二羟基-9H-芴-9-酮发生了缩合反应。对反应混合物进行适当处理后,再经过色谱纯化得到了一类新型环方烃的53-27%的代表性产物,称为双(氧芴)冠方烃。将温度提高到95-105°C会显著降低产物的产率。而用铯碳酸盐替代碳酸钾,并没有提高目标产物的产率。