Lewis Acid Acceleration of C−N Bond-Forming Reductive Elimination from Heteroarylpalladium Complexes and Catalytic Amidation of Heteroaryl Bromides
作者:Qilong Shen、John F. Hartwig
DOI:10.1021/ja0722473
日期:2007.6.1
addition of Lewisacids is described. Several lines of data imply that this effect arises from coordination of the Lewisacid to the nitrogen of the heteroaryl group. The presence of this coordination was confirmed by isolation of a Lewisacid base complex with a borane coordinated to the pyridyl nitrogen. This adduct underwent reductive elimination faster than the complex lacking the Lewisacid, and it
REAGENT FOR ORGANIC SYNTHESIS REACTION CONTAINING ORGANIC TRIOL BORATE SALT
申请人:Miyaura Norio
公开号:US20100087646A1
公开(公告)日:2010-04-08
[Problem] To provide an organoboron compound-containing reagent for organic synthesis reactions which undergoes no trimerization with dehydration, does not necessitate activation with a base, and is stable and highly active.
[Means for Solving Problems] The reagent for organic synthesis reactions contains an organic triol borate salt represented by any of the general formulae (I) to (III) and general formula (XVI): (wherein R
1
represents alkyl, alkenyl, etc.; R
2
represents optionally substituted alkyl, alkenyl, alkynyl, etc. or represents hydrogen; m
+
represents an alkaline metal ion, phosphonium ion, or given ammonium ion; M
2+
represents an alkaline earth metal; X represents halogen or alkoxide; Y represents an alkali metal ion, etc.; A represents optionally substituted methylene; and n represents an integer).
Mn-Catalyzed Three-Component Reactions of Imines/Nitriles, Grignard Reagents, and Tetrahydrofuran: An Expedient Access to 1,5-Amino/Keto Alcohols
作者:Ruoyu He、Xiqing Jin、Hui Chen、Zhi-Tang Huang、Qi-Yu Zheng、Congyang Wang
DOI:10.1021/ja503520t
日期:2014.5.7
An expedient Mn-catalyzed three-component synthesis of 1,5-amino/keto alcohols from Grignardreagents, imines/nitriles, and tetrahydrofuran (THF) is described, which deviates from the classic Grignard addition to imines/nitriles in THF solvent. THF is split and "sewn" in an unprecedented manner in the reaction, leading to the formation of two geminal C-C bonds via C-H and C-O cleavage. Mechanistic
描述了从格氏试剂、亚胺/腈和四氢呋喃 (THF) 中 Mn 催化的 1,5-氨基/酮醇的三组分合成,这与传统格氏在 THF 溶剂中加入亚胺/腈不同。THF 在反应中以前所未有的方式分裂和“缝合”,导致通过 CH 和 CO 裂解形成两个孪生 CC 键。机理实验和 DFT 计算揭示了催化循环中的自由基和有机锰中间体,以及作为关键反应步骤的 THF 的 α-芳基开环。
Brönsted Acid-Catalyzed One-Pot Synthesis of Indoles from <i>o</i>-Aminobenzyl Alcohols and Furans
作者:Alexey Kuznetsov、Anton Makarov、Aleksandr E. Rubtsov、Alexander V. Butin、Vladimir Gevorgyan
DOI:10.1021/jo402132p
日期:2013.12.6
Brönstedacid-catalyzed one-pot synthesis of indoles from o-aminobenzyl alcohols and furans has been developed. This method operates via the in situ formation of aminobenzylfuran, followed by its recyclization into the indole core. The method proved to be efficient for substrates possessing different functional groups, including −OMe, −CO2Cy, and −Br. The resulting indoles can easily be transformed
Room-Temperature Kumada Cross-Coupling of Unactivated Aryl Chlorides Catalyzed by <i>N</i>-Heterocylic Carbene-Based Nickel(II) Complexes
作者:Zhenxing Xi、Bin Liu、Wanzhi Chen
DOI:10.1021/jo800197u
日期:2008.5.1
The Kumada cross-coupling reaction of a variety of unactivated aryl chlorides, vinyl chlorides, and heteroaryl chlorides catalyzed by nickel(II) complexes containing pyridine-functionalized NHC ligands is described. The catalysts are so active that the reactions proceed at room temperature in excellent yields.