Tilivalline(1a),肺炎克雷伯菌的一种代谢产物。催产素及其衍生物1已由叠氮基磷酸二苯酯,2-恶唑啉2,L-脯氨酸衍生物5和吲哚有效地和立体选择性地合成;关键步骤是伴随完全立体选择性引入吲哚的曼尼希型分子内环化反应。此外,通过使用这种新的曼尼希型环化反应,还由乙缩醛酰胺9a和各种亲核试剂合成了11个取代的5 H-吡咯并[2,1- c ] [1,4]苯并二氮杂-5-酮(16)。。
inexpensive method using microwave-assisted irradiation with Ni2B for the syntheses of aromatic amines, pyrrolobenzodiazepines as well as pyrroloquinazolinones was developed. This protocol was applied in the tandem resin-cleavage, azido reduction, and cyclization of compounds 3 and 5 that afforded substituted pyrrolo[2,1-c][1,4]benzodiazepines 4 and 6 in a one-pot manner. The microwave-assisted irradiation
开发了一种高效且廉价的方法,该方法使用微波辅助的Ni 2 B辐射来合成芳族胺,吡咯并苯并二氮杂pine以及吡咯并喹唑啉酮。该方案适用于串联式树脂裂解,叠氮基还原和化合物3和5的环化反应,这些化合物以一锅方式提供取代的吡咯并[2,1- c ] [1,4]苯并二氮杂卓4和6。与常规的热反应相比,微波辅助的辐射反应以非常短的反应时间提高了产率。 吡咯并[2,1- c ] [1,4]苯并二氮杂卓-吡咯并喹唑啉酮-叠氮还原环化-硼化镍-微波辐射
Chemoselective Aromatic Azido Reduction with Concomitant Aliphatic Azide Employing Al/Gd Triflates/NaI and ESI-MS Mechanistic Studies
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。
New methods and reagents in organic synthesis. 65. A stereoselective synthesis of tilivalline
Tilivalline (1), a metabolite from Klebsiella, has been efficiently and stereoselectively synthesized from diphenyl phosphorazidate (DPPA), the 2-oxazoline 2, the L-proline derivative 5, and indole: the key step is a Mannich type intramolecular cyclization accompanied with simultaneous and completely stereoselective introduction of indole.