Rhenium-Catalyzed Regioselective Synthesis of Multisubstituted Pyridines from β-Enamino Ketones and Alkynes via C–C Bond Cleavage
摘要:
A new method is described for the regioselective synthesis of multisubstituted pyridine derivatives. Treatment of N-acetyl beta-enamino ketones with alkynes in the presence of the rhenium catalyst, Re-2(CO)(10), gives multisubstituted pyridines regioselectively. In this reaction, the N-acetyl moieties are important for the selective formation of the multisubstituted pyridines. This reaction proceeds via insertion of alkynes into a carbon carbon single bond of beta-enamino ketones, intramolecular nucleophilic cyclization, and elimination of acetic acid.
Facile Synthesis of Pyridines from Propargyl Amines: Concise Total Synthesis of Suaveoline Alkaloids
作者:Zhiwen Zhao、Hongbo Wei、Ke Xiao、Bin Cheng、Hongbin Zhai、Yun Li
DOI:10.1002/anie.201811812
日期:2019.1.21
A general and efficient protocol was developed for the synthesis of polysubstituted pyridines from propargyl amines and unsaturated carbonyl compounds through a tandem condensation/alkyne isomerization/6π 3‐azatriene electrocyclization sequence. This process was found to be applicable to a wide range of readily available substrates (30 examples, up to 95 % yield) and could be readily performed on a
Quick Access to Pyridines through 6π-3-Azatriene Electrocyclization: Concise Total Synthesis of Suaveoline Alkaloids
作者:Hongbo Wei、Yun Li
DOI:10.1055/s-0037-1611811
日期:2019.9
different methodologies have been developed for the synthesis of these kinds of molecules. However, a sustainable and efficient procedure for the synthesis of pyridines is still highly desirable. In this Synpacts article, we highlight our recent approach to the construction of highly substituted pyridines though a tandem condensation/alkyne isomerization/6π-3-azatriene electrocyclization sequence.
The present invention relates to a serotonin 5-HT
2C
receptor activator containing a compound represented by the formula
wherein ring A is a 5- or 6-membered aromatic heterocycle optionally having substituent(s), and ring B is a 7- to 9-membered ring optionally having substituent(s) other than an oxo group wherein the combination of m and n (m,n) is (1,2), (2,1), (2,2), (3,1), (3,2) or (4,1), or a salt thereof or a prodrug thereof, and a fused heterocyclic compound having a serotonin 5-HT
2C
receptor activating action and the like.
The present invention relates to a serotonin 5-HT
2C
receptor activator containing a compound represented by the formula
wherein ring A is a 5- or 6-membered aromatic heterocycle optionally having substituent(s), and ring B is a 7- to 9-membered ring optionally having substituent(s) other than an oxo group wherein the combination of m and n (m,n) is (1,2), (2,1), (2,2), (3,1), (3,2) or (4,1), or a salt thereof or a prodrug thereof, and a fused heterocyclic compound having a serotonin 5-HT
2C
receptor activating action and the like.