A Strategy for the Synthesis of Aryl α-Ketoamides Based upon the Acylation of Anions Derived from Cyanomethylamines Followed by Oxidative Cleavage
摘要:
[GRAPHICS]Cyanomethylamines, prepared by alkylation of amines with chloroacetonitrile, were deprotonated using NaHDMS in THF, reacted with heteroaryl or substitutedphenyl esters, and then oxidized by adding Clorox(TM) to afford aryl alpha-ketoamides in a single operation In good overall yields.
Double carbonylation of aryl iodides with diethylamine catalyzed by dinuclear palladium complexes
作者:Naofumi Tsukada、Yoichi Ohba、Yoshio Inoue
DOI:10.1016/j.jorganchem.2003.08.014
日期:2003.12
Dinuclear palladium complexes bridged by a novel PNNP ligand, N,N′-bis[(2-diphenylphosphino)phenylformamidinate (dpfam), were found to be very efficient and selective catalysts for the doublecarbonylation of iodobenzene with diethylamine using K3PO4 as base and 1,4-dioxane as solvent with a TON up to 105 and selectivity of 96%.
已发现由新型PNNP配体N,N'-双[(2-二苯基膦基)苯基甲ami酸盐(dpfam)桥接的双核钯络合物是非常有效的选择性催化剂,可使用K 3 PO 4作为二乙胺与二乙胺进行双羰基化反应。碱和1,4-二恶烷作为溶剂,TON高达10 5,选择性为96%。
Synthesis of pyridylglyoxylic acid derivatives via a palladium-catalysed double carbonylation of iodopyridines
4-Iodopyridiens react with CO and HNEt2 or in the presence of a catalytic amount of PdCl2(PPh3)2 to give the corresponding α-keto amides and esters in fair to high yields.
The preparation of 2-pyridyl- and 4-pyridylglyoxylic esters and amides in moderate to high yields via palladium-catalyzed double carbonylation of 2-iodo- and 4-iodopyridines is reported. The effect of temperature, CO pressure, solvent, nature and concentration of nucleophile, nature of catalyst precursor, and substituents on iodopyridines has been investigated. The reduction of 4-pyridylglyoxylate esters into the corresponding alpha -hydroxy esters via ruthenium-catalyzed asymmetric hydrogenation or using alpine-borane proceeded in high yields but poor enantioselectivity. The results for the carbonylation and the hydrogenation catalytic processes are discussed in terms of electronic effects induced by the pyridyl ring.
JONES, G.;MOUAT, D. J.;TONKINSON, D. J., J. CHEM. SC. PERKIN TRANS., 1985, N 12, 2719-2723