Use of the Curtius Rearrangement of Acryloyl Azides in the Synthesis of 3,5-Disubstituted Pyridines: Mechanistic Studies
作者:Ta-Hsien Chuang、Yu-Chi Chen、Someshwar Pola
DOI:10.1021/jo101394c
日期:2010.10.1
A series of disubstituted pyridine derivatives was synthesized from the corresponding acryloyl azides by acetic acid-promoted cycloaddition. This represents a novel and convenient synthetic approach to the symmetric 3,5-disubstituted pyridines. The nature of the substituent on the double bond and the utilized solvent were found to be crucial to the yield of pyridines. The reactivity of the acid-promoted
Insight into Copper Catalysis: In Situ Formed Nano Cu<sub>2</sub>O in Suzuki–Miyaura Cross-Coupling of Aryl/Indolyl Boronates
作者:Ganapathy Ranjani、Rajagopal Nagarajan
DOI:10.1021/acs.orglett.7b01669
日期:2017.8.4
aryl and indole boronates has been explored in good to excellent yields. In situ generation of nano-Cu2O from CuCl2 under the reaction conditions has been discovered for the first time. The generality of the reaction was further demonstrated by the arylation of 5-iodopyrimidine, iodopyridines, iodobenzenes, and diiodobenzenes and resulted in good to moderate yields. Moreover, bisindole alkaloid Scalaridine
Triarylbismuthanes as Threefold Aryl-Transfer Reagents in Regioselective Cross-Coupling Reactions with Bromopyridines and Quinolines
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1002/ejoc.201402455
日期:2014.8
Cross-coupling studies using bromopyridines and bromoquinolines with triarylbismuths as threefold coupling reagents in substoichiometric amounts under Pd-catalysed conditions are disclosed. The reactivity was high with both mono- and dibromopyridyl substrates, and mono- and bis-couplings were carried out regioselectively. A library of monoaryl and diaryl pyridines was formed in high yields. A one-pot
A highly selectivecopper-catalyzed concise synthesis of 3,5-diarylpyridine and 2-(1H)-pyridone has been achieved through cascade Chichibabin-type cyclization, C(sp3)–C(sp3) cleavage, and aerobicoxidation. Azide, ceric ammonium nitrate (CAN), and 2-aminopyridine are disclosed as efficient nitrogen donors in this Cu-catalysis using O2 as the oxidant. Water and molecular oxygen were employed as the
method for the synthesis of substituted pyridines with aldehydes and NH4OAc under mild conditions using air as the oxidant was developed. This oxidative cyclization process involves directC–Hbondfunctionalization, C–C/C–N bond formation and C–Cbondcleavage.