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.
Palladium-Catalyzed C–P Bond-Forming Reactions of Aryl Nonaflates Accelerated by Iodide
作者:Holly McErlain、Leanne M. Riley、Andrew Sutherland
DOI:10.1021/acs.joc.1c02172
日期:2021.12.3
iodide-accelerated, palladium-catalyzed C–P bond-forming reaction of aryl nonaflates is described. The protocol was optimized for the synthesis of aryl phosphine oxides and was found to be tolerant of a wide range of aryl nonaflates. The general nature of this transformation was established with coupling to other P(O)H compounds for the synthesis of aryl phosphonates and an aryl phosphinate. The straightforward
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。
Catalytic Coupling of Aryl Sulfonates with sp2-Hybridized Nitrogen Nucleophiles: Palladium- and Nickel-catalyzed Synthesis of N-Aryl Sulfoximines
作者:Carsten Bolm、Jens P. Hildebrand、Jens Rudolph
DOI:10.1055/s-2000-6287
日期:——
Several sulfoximines have been arylated in good to high yield by palladium catalysis using aryl nonaflates and aryl triflates. Moreover, the successful synthesis of N-aryl sulfoximines from aryl tosylates is described using a Ni(COD)2/BINAP catalyst.
The palladium catalyzed phosphination of functionalized aryl bromides, triflates, and chlorides with triphenylphosphine to yield aryldiphenylphosphines was catalyzed by thermally stable palladium catalysts supported on charcoal and aluminia. The addition of NaI promoted both the rates and yields in the phosphination with Pd/C.