NNN-Ruthenium Catalysts for the Synthesis of Pyridines, Quinolines, and Pyrroles by Acceptorless Dehydrogenative Condensation
作者:Danfeng Deng、Bowen Hu、Min Yang、Dafa Chen
DOI:10.1021/acs.organomet.8b00359
日期:2018.7.23
The bidentate rutheniumcomplex (HO-C5H3N-CO-C5H3N-C5H4N)Ru(CO)2Cl2 (2) could transform to a tridentate product (HO-C5H3N-CO-C5H3N-C5H4N)Ru(CO)Cl2 (3), which further reacted with CH3ONa in the presence of PPh3 to convert to two complexes [(OC5H3N-CO-C5H3N-C5H4N)Ru(PPh3)2(CO)]Cl– (4) and [(OC5H3N-CO-C5H3N-C5H4N)Ru(PPh3)(CO)Cl] (5), via −OH deprotonation. The catalytic coupling cyclizations of secondary
双齿钌配合物(HO-C 5 H 3 N-CO-C 5 H 3 N-C 5 H 4 N)Ru(CO)2 Cl 2(2)可以转变为三齿产物(HO-C 5 H 3 N- CO-C 5 H 3 N-C 5 H 4 N)Ru(CO)Cl 2(3),其在PPh 3存在下进一步与CH 3 ONa反应,转化为两种络合物[(OC 5 H 3 N-CO- C 5高3NC 5 H 4 N)Ru(PPh 3)2(CO)] Cl –(4)和[(OC 5 H 3 N-CO-C 5 H 3 N-C 5 H 4 N)Ru(PPh 3)(CO) Cl](5),通过-OH去质子化。研究了仲醇与氨基醇的催化偶合环化反应,并且配合物3表现出最高的活性。偶联反应在空气中仅以0.2 mol%的催化剂负载量进行,并具有广泛的吡啶,喹诺酮和吡咯的合成范围。
Heteroaromatic Synthesis <i>via</i> Olefin Cross-Metathesis: Entry to Polysubstituted Pyridines
作者:Timothy J. Donohoe、José A. Basutto、John F. Bower、Akshat Rathi
DOI:10.1021/ol103088r
日期:2011.3.4
The olefin cross-metathesis reaction provides a rapid and efficient method for the synthesis of α,β-unsaturated 1,5-dicarbonyl derivatives which then serve as effective precursors to mono−tetrasubstituted pyridines. Manipulation of the key 1,5-dicarbonyl intermediate allows access to pyridines with a wide range of substitution patterns. An extension of this methodology facilitates the preparation of
Mn(III)-Mediated Reactions of Cyclopropanols with Vinyl Azides: Synthesis of Pyridine and 2-Azabicyclo[3.3.1]non-2-en-1-ol Derivatives
作者:Yi-Feng Wang、Shunsuke Chiba
DOI:10.1021/ja905110c
日期:2009.9.9
to the formation of 2-azabicyclo[3.3.1]non-2-en-1-ol derivatives using a catalytic amount of Mn(acac)(3). These reactions may be initiated by a radicaladdition of beta-keto radicals, generated by the one-electron oxidation of cyclopropanols, to vinyl azides to give iminyl radicals, which would cyclize with the intramolecular carbonyl groups. In addition, versatile transformations of 2-azabicyclo[3.3
The first example of the Pd-catalyzed addition of organoboron reagents to dinitriles, as an efficient means of preparing 2,5-diarylpyrroles and 2,6-diarylpyridines, has been discussed here. Furthermore, the highly selective carbopalladation of dinitriles with organoboron reagents to give long-chain ketonitriles has been developed as well. Based on the broad scope of substrates, excellent functional
A palladium(II)/copper oxide (Cu2O)‐catalyzed one‐pot decarboxylative and directCHarylation of 2‐picolinic acid with aryl bromides has been developed. Various aryl bromides have been shown to be efficient coupling partners in the presence of dimethyl sulfate, furnishing symmetrical 2,6‐diarylpyridines in moderate to good yields.