A Facile Chiral Pool Synthesis of (S)-6-Nitroindoline-2-carboxylic Acid from l-Phenylalanine
作者:Chao Qian、Jin-Qiang Liu、Xin-Zhi Chen
DOI:10.1055/s-0029-1217122
日期:2010.2
(S)-6-Nitroindoline-2-carboxylic acid, a substructure occurring in numerous biologically active natural products, was synthesized with moderate yield (53%) and high enantiomeric excess (>99.5%) starting from the nitration of l-phenylalanine, which is a commercially available chiral pool compound, followed by successively bromination and intramolecular cyclization. The route was carried out in gram quantities and it is suitable for industrial application due to its convenient reaction conditions and low cost.
(S)-6-硝基吲哚啉-2-羧酸是许多生物活性天然产物中存在的一种子结构,从 L-苯丙氨酸的硝化开始合成,产率适中 (53%),对映体过量 (>99.5%),这是一种市售的手性池化合物,然后依次进行溴化和分子内环化。该路线以克量级进行,反应条件方便,成本低廉,适合工业化应用。