triflates catalyze the chemoselective reduction of aromatic azides to the corresponding amines in combination with sodium iodide. This mild chemoselective method has been applied to the synthesis of various aryl amines, C2‐azido‐substituted pyrrolo[2,1‐c][1,4]benzodiazepines, and fused[2,1‐b]quinazolinones by an intramolecular azido reduction tandem cyclization reaction. Interestingly, this methodology
铝和ado三氟甲磺酸盐与碘化钠一起催化将芳族叠氮化物化学选择性还原为相应的胺。这种温和的化学选择性方法已应用于各种芳基胺的合成,C2叠氮基取代的吡咯并[2,1- c ^ ] [1,4]苯二氮,和稠合[2,1- b通过分子内还原叠氮]喹唑啉酮串联环化反应。有趣的是,这种方法选择性地还原了芳基叠氮化物,提高了产率,并且比以前的策略在较短的反应时间内进行。已对机理进行了研究,并通过ESI-MS在线监测反应来拦截和表征与这种选择性转化有关的中间体。
Synthesis of DNA-Interactive Pyrrolo[2,1-<i>c</i>][1,4]benzodiazepines by Employing Polymer-Supported Reagents: Preparation of DC-81
作者:Ahmed Kamal、K. Reddy、V. Devaiah、N. Shankaraiah
DOI:10.1055/s-2004-834821
日期:——
generation of combinatorial library of substituted pyrrolo[2,1-c][1,4]benzodiazepine derivatives that provides a clean and efficient preparation and does not require conventional purification techniques like chromatography. This methodology involves intra molecular aza-Wittig reaction and has been extended for the synthesis of the naturalproduct DC-81 in good overall yields.