Pd-Catalyzed Conversion of Aryl Chlorides, Triflates, and Nonaflates to Nitroaromatics
摘要:
An efficient Pd catalyst for the transformation of aryl chlorides, triflates, and nonaflates to nitroaromatics has been developed. This reaction proceeds under weakly basic conditions and displays a broad scope and excellent functional group compatibility. Moreover, this method allows for the synthesis of aromatic nitro compounds that cannot be accessed efficiently via other nitration protocols. Mechanistic insight into the transmetalation step of the catalytic process is also reported.
Expedited Palladium-Catalyzed Amination of Aryl Nonaflates through the Use of Microwave-Irradiation and Soluble Organic Amine Bases
作者:Rachel E. Tundel、Kevin W. Anderson、Stephen L. Buchwald
DOI:10.1021/jo052131u
日期:2006.1.1
Microwave-assisted, palladium-catalyzed C−N bond-forming reactions with aryl/heteroaryl nonaflates and aminesusing the soluble aminebases DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) or MTBD (7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene) and ligands (1−3) resulted in good to excellent yields (71−99%) of arylamines in short reaction times (1−45 min).
作者:Kevin W. Anderson、Maria Mendez-Perez、Julian Priego、Stephen L. Buchwald
DOI:10.1021/jo034962a
日期:2003.12.1
detailed study of the palladium-catalyzedamination of aryl nonaflates is reported. Use of ligands 2-4 and 6 allows for the catalytic amination of electron-rich and -neutral aryl nonaflates with both primary and secondary amines. With use of Xantphos 5, the catalytic amination of a variety of functionalized aryl nonaflates resulted in excellent yields of anilines; even 2-carboxymethyl aryl nonaflate is effectively
Pd-Catalyzed N-Arylation of Secondary Acyclic Amides: Catalyst Development, Scope, and Computational Study
作者:Jacqueline D. Hicks、Alan M. Hyde、Alberto Martinez Cuezva、Stephen L. Buchwald
DOI:10.1021/ja9044357
日期:2009.11.25
efficient N-arylation of acyclic secondary amides and related nucleophiles with aryl nonaflates, triflates, and chlorides. This method allows for easy variation of the aromatic component in tertiary aryl amides. A new biaryl phosphine with P-bound 3,5-(bis)trifluoromethylphenyl groups was found to be uniquely effective for this amidation. The critical aspects of the ligand were explored through synthetic, mechanistic
我们报告了无环仲酰胺和相关亲核试剂与芳基九氟甲磺酸酯、三氟甲磺酸酯和氯化物的有效 N-芳基化。这种方法可以很容易地改变叔芳基酰胺中的芳香族成分。发现具有 P 键合 3,5-(双) 三氟甲基苯基的新联芳基膦对这种酰胺化反应特别有效。通过合成、机械和计算研究探索了配体的关键方面。配体的系统变异揭示了 (1) 与磷相邻的“顶环”芳香碳上的甲氧基和 (2) 两个高度吸电子的 P 键合 3,5-(双) 三氟甲基苯基的重要性. 计算研究表明,配体的缺电子性质对于促进酰胺与 LPd(II)(Ph)(X) 中间体的结合很重要。
A palladium-catalyzed coupling reaction of aryl nonaflates, sulfur dioxide, and hydrazines
作者:Yuanyuan An、Hongguang Xia、Jie Wu
DOI:10.1039/c5ob02514a
日期:——
nonaflates, sulfurdioxide, and hydrazines is reported. This transformation proceeds in the presence of Pd(OAc)2/XantPhos, and TBAB in 1,4-dioxane at 80 °C, leading to the corresponding N-aminosulfonamides in moderate to good yields. The reaction scope has been demonstrated, and good functional tolerance is observed. A plausible mechanism is proposed through the insertion of sulfurdioxide.
Mo(CO)6 as a Solid CO Source in the Synthesis of Aryl/Heteroaryl Weinreb Amides under Microwave-Enhanced Condition
作者:Raghu Ningegowda、Savitha Bhaskaran、Ayyiliath M. Sajith、Chandrashekar Aswathanarayanappa、M. Syed Ali Padusha、Nanjunda Swamy Shivananju、Babu Shubha Priya
DOI:10.1071/ch16213
日期:——
The facile transformation of aryl/heteroaryl nonaflates into corresponding amides via Pd-catalyzed aminocarbonylation using Mo(CO)6 as a solid CO source under microwave-enhanced condition is reported. The method was found to be tolerant with respect to a diverse range of electronically biased aryl/heteroaryl nonaflates, and exceptional yields were obtained. The optimized protocol was further extended