TMSOTf-mediated Kröhnke pyridine synthesis using HMDS as the nitrogen source under microwave irradiation
作者:Chieh-Kai Chan、Yi-Hsiu Chung、Cheng-Chung Wang
DOI:10.1039/d2ra00084a
日期:——
An efficient protocol for the preparation of pyridine skeletons has been successfully developed involving the TMSOTf/HMDS (trifluoromethanesulfonic acid/hexamethyldisilane) system for the intermolecular cyclization of chalcones under MW (microwave) irradiation conditions. This method provides a facile approach to synthesize 2,4,6-triaryl or 3-benzyl-2,4,6-triarylpyridines in good to excellent yields
Synthesis of Kröhnke pyridines through iron-catalyzed oxidative condensation/double alkynylation/amination cascade strategy
作者:Kovuru Gopalaiah、Renu Choudhary
DOI:10.1016/j.tet.2021.132429
日期:2021.10
protocol for the synthesis of symmetrical and unsymmetrical 2,4,6-trisubstituted pyridines via oxidative cascade annulation of arylacetylenes with benzylamines has been developed. The reaction proceeds smoothly utilizing iron(II) triflate as a catalyst and molecular oxygen as an oxidant with broad substrate scope. Mechanistic studies reveal that the reaction may be experiences an oxidative condensation
Acid-controlled multicomponent selective synthesis of 2,4,6-triaryl pyridines and pyrimidines by using hexamethyldisilazane as a nitrogen source under microwave irradiation
作者:Chieh-Kai Chan、Yi-Hsiu Chung、Cheng-Chung Wang
DOI:10.1039/d2ra04739j
日期:——
protocol for the synthesis of functionalized 2,4,6-triaryl pyridines and pyrimidines was developed from commercially available aromatic ketones, aldehydes and hexamethyldisilazane (HMDS) as a nitrogen source undermicrowave irradiation. In this multicomponent synthetic route, Lewis acids play an important role in selectively synthesizing six-membered heterocycles, including pyridines (1N) and pyrimidines
Novel solid-supported dimerization–heteroannulation of chalcones: simple and efficient synthesis of 2,4,6-triaryl-3-methylarylpyridines
作者:Anil K. Verma、Summon Koul、Ajay P.S. Pannu、Tej K. Razdan
DOI:10.1016/j.tet.2007.06.049
日期:2007.9
2,4,6-Triaryl-3-methylarylpyridines were obtained, in 60-70% yield, by a novel one-pot solventless solid-supported dimerization-heteroannulation reaction of chalcones and compounds possessing terminal -CONH2 functionality, at 125-135 degrees C, using immobilized Bi(III) nitrate and Zn(II) chloride as co-catalyst. Initially, chalcones were prepared, in nearly quantitative yield, by a modified aldol condensation, in neutral aqueous medium, in the presence of p-toluenesodium sulfonate. (c) 2007 Elsevier Ltd. All rights reserved.