Facile and Efficient Synthesis of 2-Aminoquinoline-3-carboxylic Acid Derivatives via Reductive Cyclization of Nitro and Cyano Groups Induced by Low-valent Titanium
Facile and Efficient Synthesis of 2-Aminoquinoline-3-carboxylic Acid Derivatives via Reductive Cyclization of Nitro and Cyano Groups Induced by Low-valent Titanium
Low-Valent Titanium Induced Reductive Coupling of Nitriles with Nitro Compounds
作者:Longhu Zhou、Yongmin Zhang
DOI:10.1080/00397919808004430
日期:1998.9
Abstract The intermolecular and intramolecular reductivecoupling of a cyano group with a nitro group induced by a low-valenttitanium reagent prepared from TiCl4/Sm was studied. Amidines and 2-aminoquinolines derivatives are preparied in good yields under mild conditions respectively.
Expedious and practical synthesis of the bioactive alkaloids rutaecarpine, euxylophoricine A, deoxyvasicinone and their heterocyclic homologues
作者:Abdulkareem Hamid、Abdelhakim Elomri、Adam Daïch
DOI:10.1016/j.tetlet.2006.01.031
日期:2006.3
deoxyvasicinone (3), is reported from suitable aromatic amino acids 7 or corresponding aromatic amino esters 8 and imino-thioethers 5 or 6 in a one-step sequence in moderate to good yields. The key step of this methodology is based on an intramolecular aza-displacement of a methylthio group followed by spontaneous cyclodehydration. Furthermore, when aromatic amino esters 8 were used instead of amino acids