Air-stable zirconocene bis(perfluorobutanesulfonate) as a highly efficient catalyst for synthesis of α-aminophosphonates via Kabachnik–Fields reaction under solvent-free condition
Zirconocene bis(perfluorobutanesulfonate) [Cp2Zr(OSO2C4F9)2·2H2O] was successfully synthesized by treatment of Cp2ZrCl2 with C4F9SO3Ag, and was found to have the nature of air-stability, water tolerance, high thermal stability and strong Lewis acidity. This complex showed high catalytic efficiency for the synthesis of α-aminophosphonates via Kabachnik–Fields reaction of aldehydes/ketones, amines and
通过用C 4 F 9 SO 3处理Cp 2 ZrCl 2成功地合成了茂锆双(全氟丁烷磺酸盐)[Cp 2 Zr(OSO 2 C 4 F 9)2 ·2H 2 O]。Ag,并且具有空气稳定性,耐水性,高热稳定性和强路易斯酸性的性质。该络合物在温和无溶剂的条件下,通过Kabachnik-Fields反应醛/酮,胺和亚磷酸二乙酯,显示出对α-氨基膦酸酯合成的高催化效率。此外,在五个周期的测试中,它可以重复使用而不会失去活动。与我们先前报道的Cp 2 Zr(OSO 2 C 8 F 17)2 ·3H 2 O·THF配合物相比,该配合物表现出更好的催化活性。
Efficient solvent free synthesis of tertiary α-aminophosphonates using H<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>nanotubes as a reusable solid-acid catalyst
作者:Bhoomireddy Rajendra Prasad Reddy、Peddiahgari Vasu Govardhana Reddy、Bijivemula N. Reddy
DOI:10.1039/c5nj01914a
日期:——
The Kabachnik–Fields reaction was applied for the synthesis of α-aminophosphonates from aldehydes, secondary amines and dialkyl phosphites in the presence of H2Ti3O7nanotubes as reusable solid-acid catalysts.
Silica gel supported aluminum chloride (SiO2-AlCl3) and cross-linked polystyrene-supported aluminum chloride (PS-AlCl3) are environment- friendly heterogeneouscatalysts for the condensation of amines and aldehydes with diethyl phosphite to afford α-aminophosphonates. These solid acid catalysts are stable (as bench top catalysts) and can be easily recovered and reused without appreciable change in
Synthesis of tertiary α-amino phosphonate by one-pot three-component coupling mediated by LPDE
作者:Najmedin Azizi、Mohammad R. Saidi
DOI:10.1016/s0040-4020(03)00759-2
日期:2003.7
A very mild, efficient and simple method for the synthesis of tertiary α-amino phosphonates is reported by reaction of an aldehyde, a secondary amine and trialkylphosphite in ethereal solution of lithium perchlorate, LPDE, at ambient temperature with high yields.
The three component, one-potsynthesis of α-aminophosphonates has been achieved using super magnetic nano iron oxide at 50 °C under solvent-free conditions in excellent yields. The major advantages of the present method are high yields, short reaction times, magnetically recyclablecatalyst, and solvent-free reaction conditions.