Synthesis and Solid State and Solution Characterization of Mono- and Di-(η<sup>1</sup>-C) Carbamoyl−Palladium Complexes. New Efficient Palladium-Catalyzed Routes to Carbamoyl Chlorides: Key Intermediates to Isocyanates, Carbamic Esters, and Ureas
作者:Michele Aresta、Potenzo Giannoccaro、Immacolata Tommasi、Angela Dibenedetto、Anna Maria Manotti Lanfredi、Franco Ugozzoli
DOI:10.1021/om000198w
日期:2000.9.1
Pd complexes have been used in catalytic conversion of primary and secondary amines into isocyanates or carbamoyl chlorides, respectively. The latter have been used as intermediates for the synthesis of carbamates and ureas. The palladium-based catalytic system is very active and operates in two steps, avoiding the synthesis of phosgene (COCl2), but making use of CO and Cl2 as in phosgene chemistry
Pd络合物已分别用于将伯胺和仲胺催化转化为异氰酸酯或氨基甲酰氯。后者已用作合成氨基甲酸酯和脲的中间体。钯基催化系统非常活跃,分两步运行,避免了光气(COCl 2)的合成,但在光气化学中却使用了CO和Cl 2。在第一步中,钯(II)络合物PdCl 2 L 2 [L 2 = 2,2'二吡啶(dipy)或1,10-菲咯啉(phen);L =三苯基膦(PPh 3)]与胺[NH 2 R,R = n -C 3 H 7(a),n -C 4 H 9(b),n -C 5 H 11(c);NHRR' , NRR'= CH 2(CH 2)4 N(d),CH 2(CH 2 OCH 2)CH 2 N(e)]和CO生成氨基甲酰基复合物PdCl(CONHR)L 2和PdCl (2 - X)(CONRR')X大号2(X = 1,2)。当伯胺为NH使用2 R,(a,b和c),仅单氨基甲酰基络合物[PdCl(CONHR)(dipy)(1a
Palladium-catalyzed intermolecular carbonylative cross-coupling of heteroaryl C(sp<sup>2</sup>)–H bonds with amines: an efficient strategy for oxidative aminocarbonylation of azoles
作者:Qi Xing、Hui Lv、Chungu Xia、Fuwei Li
DOI:10.1039/c7cc03274a
日期:——
An efficient palladium-catalyzed oxidative aminocarbonylation of azoles has been developed. This system allows for intermolecular carbonylative cross-coupling of aromatic C(sp2)–H bonds with simple amines, which has often been asked for, but has not been realized so far. It provides a straightforward approach to a variety of azol-2-amides.