Proline catalyzed sequential α-aminooxylation or -amination/reductive cyclization of o-nitrohydrocinnamaldehydes: a high yield synthesis of chiral 3-substituted tetrahydroquinolines
作者:Varun Rawat、B. Senthil Kumar、Arumugam Sudalai
DOI:10.1039/c3ob40320c
日期:——
A new sequential organocatalytic method for the synthesis of chiral 3-substituted (X = OH, NH2) tetrahydroquinoline derivatives (THQs) [ee up to 99%, yield up to 87%] based on α-aminooxylation or -amination followed by reductive cyclization of o-nitrohydrocinnamaldehydes has been described. This methodology has been efficiently demonstrated in the synthesis of two important bioactive molecules namely (â)-sumanirole (96% ee) and 1-[(S)-3-(dimethylamino)-3,4-dihydro-6,7-dimethoxy-quinolin-1(2H)-yl]propanone (92% ee).
报道了一种新颖的串联有机催化合成方法,用于制备手性3-取代(X=OH,NH2)四氢喹啉衍生物(THQs)【ee值高达99%,产率高达87%】,该方法基于α-氨基酸氧化或氨基化后对邻硝基氢化肉桂醛进行还原环化。通过这种方法高效地合成了两个重要的生物活性分子,即(â)-苏马尼罗(96% ee)和1-[(S)-3-(二甲基氨基)-3,4-二氢-6,7-二甲氧基-喹啉-1(2H)-基]丙酮(92% ee)。