N-Halogeno compounds. Part 21. Perfluoro-(2,2,6,6-tetramethyl-N-fluoropiperidine) and its 2,6-dimethyl analogue
作者:R.Eric Banks、Mohamed K Besheesh、Nicholas J Lawrence、David J Tovell
DOI:10.1016/s0022-1139(99)00032-9
日期:1999.7
ether, followed by the addition of aqueous sulphuric acid provided 3,3,4,4,5,5-hexafluoro-2(a),6(a)-dimethyl-2(e),6(e)-bis(trifluoromethyl)piperidine (13); fluorination (with F2–N2) of 13 in trichlorofluoromethane containing anhydrous potassium fluoride provided 3,3,4,4,5,5-hexafluoro-2(a),6(a)-dimethyl-2(e),6(e)-bis(trifluoromethyl)-N-fluoropiperidine (14), the stereochemistry of which was established
全氟-(2,2,6,6-四甲基哌啶)-(2,2,6,6-四甲基-N-氟哌啶)(1)是通过直接氟化(用F 2 -N 2)合成的(1)10)在冷的(-30°C)乙腈中,通过在过量的(三氟甲基)三甲基硅烷存在下用过量的(三氟甲基)三甲基硅烷处理全氟-(2,6-二甲基-1-氮杂环己烯)(6)来生产哌啶(10)。氟化铯。全氟-(2,6-二甲基-1-氮杂环己烯)(6)与甲基锂在乙醚中的甲基化,然后添加硫酸水溶液,得到3,3,4,4,5,5-六氟-2 (a),6(a)-二甲基-2(e),6(e)-双(三氟甲基)哌啶(13); 在含有无水氟化钾的三氯氟甲烷中进行13氟化(F 2 -N 2),得到3,3,4,4,4,5,5-六氟-2(a),6(a)-二甲基-2(e),6 (e)-双(三氟甲基)-N-氟哌啶(14),其立体化学通过X射线晶体学分析确定。用新的NF试剂更有效地进行了2-氧代环戊烷甲酸乙酯的烯醇钠