alkaloids (5−8) lacking the quinoline nitrogen atom have been prepared. Quaternization afforded the phase-transfer catalysts 10a, 10b, 11a, and 12d. Other optically active catalyst salts were prepared from the cinchona alkaloids themselves (compounds 13, 14, 15). The performances of these PT catalysts and of some others were compared in three test reactions. The deazacinchona derivatives exhibited selectivities
已经制备了四种缺乏
喹啉氮原子的
金鸡纳
生物碱 (5-8) 类似物。季
铵化得到相转移催化剂10a、10b、11a和12d。其他光学活性催化剂盐是由
金鸡纳
生物碱本身(化合物 13、14、15)制备的。在三个测试反应中比较了这些
PT 催化剂和其他一些催化剂的性能。去氮杂
金鸡纳衍
生物表现出与
天然产物衍生化合物相似或有时甚至更好的选择性。(© Wiley-
VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)