A Palladium-Catalyzed Alkylation/Direct Arylation Synthesis of Nitrogen-Containing Heterocycles
摘要:
[Graphics]A norbornene-mediated palladium-catalyzed sequence is described in which an alkyl-aryl bond and an aryl-heteroaryl bond are formed in one reaction vessel. The aryl-heteroaryl bond-forming step occurs via a direct arylation reaction. A number of six-, seven-, and eight-membered ring-annulated indoles, pyrroles, pyrazoles, and azaindoles were synthesized from the corresponding bromoalkyl azole and an aryl iodide.
synthesis of functionalized alkyl aryl ketones is reported. Studies on the electronic and steric properties of mixed aryl anhydrides indicated that the cross-coupling favored with the electron-enriched aryl acyl group. DFT calculation on the oxidative addition of Pd(II) with 2,4,6-(Cl)3C6H2CO2C(O)Ph suggested that 2,4,6-(Cl)3C6H2C(O)–O bond cleavage was more kinetically disfavored than that of the PhC(O)–O
报道了钯/降冰片烯催化的邻位酰化,用于有效合成官能化的烷基芳基酮。对混合的芳基酸酐的电子和空间特性的研究表明,交叉偶联有利于富电子的芳基酰基。用2,4,6-(Cl)3 C 6 H 2 CO 2 C(O)Ph氧化Pd(II)的DFT计算表明2,4,6-(Cl)3 C 6 H 2 C (O)–O键的断裂在动力学上比PhC(O)–O键的断裂更不利于11.7 kJ / mol。
Decarboxylative Alkynyl Termination of Palladium-Catalyzed Catellani Reaction: A Facile Synthesis of α-Alkynyl Anilines via <i>Ortho</i> C–H Amination and Alkynylation
作者:Fenggang Sun、Zhenhua Gu
DOI:10.1021/acs.orglett.5b00830
日期:2015.5.1
A palladium-catalyzed synthesis of α-alkynyl anilines is reported. The reaction proceeds via Catellani ortho C–H amination followed by decarboxylative alkynylative amination. Different terminal alkyne precursors were screened, and it was found that alkynyl carboxylic acids were superior over other alkynes, which led to operationally simple reaction conditions (no gradual addition of alkynes) and broad
Palladium-Catalyzed Norbornene-Mediated Tandem Amination/Cyanation Reaction: A Method for the Synthesis of <i>ortho</i>-Aminated Benzonitriles
作者:Bo Luo、Jin-Ming Gao、Mark Lautens
DOI:10.1021/acs.orglett.6b02249
日期:2016.9.2
norbornene-mediated tandem amination/cyanation reaction via Catellani-type C–H functionalization was developed using N-benzoyloxyamines as the amination reagent and Zn(CN)2 as the terminating agent. This transformation, in which one C–N bond and one C–C bond are formed, provides an efficient approach for the synthesis of ortho-aminated benzonitriles in one pot from easily accessible starting materials
Palladium-Catalyzed Catellani<i>ortho</i>-Acylation Reaction: An Efficient and Regiospecific Synthesis of Diaryl Ketones
作者:Yunze Huang、Rui Zhu、Kun Zhao、Zhenhua Gu
DOI:10.1002/anie.201506446
日期:2015.10.19
A palladium‐catalyzed, norbornene‐mediated Catellani ortho‐acylation reaction was developed by the use of either acyl chlorides or acid anhydrides as acylation reagents. The addition of more than a stoichiometric amount of H2O is crucial for this transformation when acid chlorides are used, and kinetic studies indicate that the active acylation reagent is possibly an acid anhydride.
Synthesis of 2-(1-Alkoxyvinyl)anilines by Palladium/Norbornene-Catalyzed Amination Followed by Termination with Vinyl Ethers
作者:Jie Wang、Zhenhua Gu
DOI:10.1002/adsc.201600339
日期:2016.9.15
A palladium/norbornene‐catalyzed ortho‐amination and ipso vinyl ether termination reaction of iodoarenes is reported. The benzyl vinyl ether serves as an efficient alternative carbonyl source in palladium/norbornene catalysis for the final ipso termination reaction to give [1‐(benzyloxy)vinyl]arenes, which readily undergo hydrolysis to deliver methyl ketones under aqueous acidic conditions. The final