Oxidative Deamination of α-Aminophosphonates and Amines by Zinc Dichromate Trihydrate (ZnCr2O7˙3H2O) under Solvent-Free Conditions at Room Temperature
作者:Sara Sobhani、Mahdi Maleki
DOI:10.1055/s-0029-1219174
日期:2010.2
A novel method for the rapid and efficient conversion of a variety ot α-aminophosphonates to α-ketophosphonates using ZnCr 2 O 7 ·3H 2 O viaoxidativedeamination under solvent-free conditions at room temperature is described. This method is also applicable to the rapid and highly selective oxidation of various types of ordinary amines (primary and secondary) to aldehydes and ketones in good to high
描述了一种使用 ZnCr 2 O 7 ·3H 2 O 在室温下无溶剂条件下通过氧化脱氨基快速有效地将多种 α-氨基膦酸酯转化为 α-酮膦酸酯的新方法。该方法也适用于各种类型的普通胺(伯胺和仲胺)以良好到高产率快速和高选择性氧化成醛和酮。
A New Synthesis of α-Ketophosphonates
作者:Kamyar Afarinkia、Andrew Faller、Andrew J. Twist
DOI:10.1055/s-2003-37341
日期:——
α-Ketophosphonates are prepared from 2-alkyl-2-phosphonyl-1,3-dithianes.
Heating of dialkylacylphosphonates with sulphonic acids under anhydrous conditions leads to the formation of alkylsulphonates an alkylcarboxylates. 31P N.m.r. spectroscopy revealed that the reaction of equimolar amounts of dimethyl benzoylphosphonate (1) and toluene-p-sulphonic acid at room temperature gives dimethyl phosphonate (6) in 50% yield. It is proposed that the by-product of this reaction
在无水条件下将二烷基酰基膦酸酯与磺酸一起加热导致形成烷基磺酸酯和烷基羧酸酯。31 P Nmr光谱显示,等摩尔量的苯甲酰基膦酸二甲酯(1)与甲苯-对-磺酸在室温下反应,生成膦酸二甲酯(6),产率为50%。建议该反应的副产物苯甲酸甲苯-对-磺酸酐(8)与过量的甲苯-对-磺酸酐反应,得到甲苯-对-磺酸酐(9)。)和苯甲酸。已显示这两种化合物与膦酸二甲酯一起加热分别产生甲苯-对-磺酸甲酯和苯甲酸甲酯。这些反应的假定副产物是亚磷酸(HPO 2)。通过对二甲基苯甲酰基膦酸酯及其质子化产物进行的MNDO / H方法进行的量子力学计算表明,二甲基苯甲酰基膦酸酯的质子化的首选位置是P O氧,在该位置的质子化之后是C–P键断裂,零活化能,生成亚磷酸二甲酯和苯甲酰阳离子。
Lanthanoid-metal-mediated reaction of acylphosphonates: evidence for the formation of an acyllanthanoid complex
The reactions of diethyl acylphosphonates (1a-e) with Yb and Sm were examined. Reactivities of Yb to 1a-e are different from those of Li and Na. Typically, ethyl benzoylphosphonate (1a) reacts with Yb metal in tetrahydrofuran-hexamethylphosphoramide to afford diethyl 1,2-diphenyl-2-oxoethyl phosphate (2a) and diethyl 1-(diethyl-phosphoryloxy)-1-phenylmethylphosphonate (3a). The formations of 2a and