我们已经开发了一种新的催化方法,用于通过PdPt-Fe 3 O 4纳米颗粒(NP)催化剂通过芳基腈与硝基烷烃的还原胺化反应,实现不对称仲胺的一锅级联反应。与单金属Pd–Fe 3 O 4或Pt–Fe 3 O 4相比,双金属催化剂的使用提高了反应性和选择性。NP催化剂。使用这种双金属催化体系,我们成功地在温和条件下合成了各种不对称仲胺。然而,含有给电子取代基的芳基腈相当耐还原胺化,当使用六氟异丙醇(HFIP)作为助溶剂时,不对称仲胺的反应选择性和收率大大提高。使用催化剂体系,可以由2-硝基苯基乙腈一锅克级地合成吲哚。由于Fe 3 O 4载体的磁性,双金属催化剂可以容易地使用外部磁体至少循环四次。
3,4-DIAMINO-3-CYCLOBUTENE-1,2-DIONE DERIVATIVES WHICH INHIBIT LEUKOCYTE ADHESION MEDIATED BY VLA-4
申请人:AMERICAN HOME PRODUCTS CORPORATION
公开号:EP1140792A1
公开(公告)日:2001-10-10
US6166050A
申请人:——
公开号:US6166050A
公开(公告)日:2000-12-26
[EN] 3,4-DIAMINO-3-CYCLOBUTENE-1,2-DIONE DERIVATIVES WHICH INHIBIT LEUKOCYTE ADHESION MEDIATED BY VLA-4<br/>[FR] DERIVES DE 3,4-DIAMINO-3-CYCLOBUTENE-1,2-DIONE PRESENTANT UNE ADHERENCE AUX LEUCOCYTES AYANT POUR ORIGINE VLA-4
申请人:AMERICAN HOME PROD
公开号:WO2000035855A1
公开(公告)日:2000-06-22
Compounds of formula (I) which inhibit leukocyte adhesion mediated by interaction of the α4β1 integrin (VLA-4) with its counterreceptor VCAM-1, and their use for the treatment of inflammatory and autoimmune diseases.
3,4-diamino-3-cyclobutene-1,2-dione derivatives which inhibit leukocyte
申请人:American Home Products Corporation
公开号:US06166050A1
公开(公告)日:2000-12-26
Compounds of the formula ##STR1## which inhibit leukocyte adhesion mediated by interaction of the .alpha..sub.4 .beta..sub.1 integrin (VLA-4) with its counterreceptor VCAM-1, and their use for the treatment of inflammatory and autoimmune diseases.
One-pot, chemoselective synthesis of secondary amines from aryl nitriles using a PdPt–Fe<sub>3</sub>O<sub>4</sub> nanoparticle catalyst
作者:Jin Hee Cho、Sangmoon Byun、Ahra Cho、B. Moon Kim
DOI:10.1039/d0cy00630k
日期:——
unsymmetrical secondary amines under mild conditions. However, aryl nitriles containing an electron-donating substituent were rather resistant to the reductive amination, and when hexafluoroisopropanol (HFIP) was used as a co-solvent, the reaction selectivity and yield for unsymmetrical secondary amines increased dramatically. Using the catalyst system, one-pot, gram-scale synthesis of indole was possible
我们已经开发了一种新的催化方法,用于通过PdPt-Fe 3 O 4纳米颗粒(NP)催化剂通过芳基腈与硝基烷烃的还原胺化反应,实现不对称仲胺的一锅级联反应。与单金属Pd–Fe 3 O 4或Pt–Fe 3 O 4相比,双金属催化剂的使用提高了反应性和选择性。NP催化剂。使用这种双金属催化体系,我们成功地在温和条件下合成了各种不对称仲胺。然而,含有给电子取代基的芳基腈相当耐还原胺化,当使用六氟异丙醇(HFIP)作为助溶剂时,不对称仲胺的反应选择性和收率大大提高。使用催化剂体系,可以由2-硝基苯基乙腈一锅克级地合成吲哚。由于Fe 3 O 4载体的磁性,双金属催化剂可以容易地使用外部磁体至少循环四次。