Cobalt(II) Phthalocyanine-Catalyzed Highly Chemoselective Reductive Amination of Carbonyl Compounds in a Green Solvent
作者:Vishal Kumar、Upendra Sharma、Praveen K. Verma、Neeraj Kumar、Bikram Singh
DOI:10.1002/adsc.201100645
日期:2012.3.16
Cobalt phthalocyanine has been employed for the highlychemoselectivereductiveamination of aldehydes and ketones in ethanol as a greensolvent. A large range of functional groups such as nitro, acid, amide, ester, nitrile, halogen, lactone, methoxy, hydroxy, alkene, N‐benzyl, O‐benzyl and heterocyclic rings were well tolerated under the present reaction conditions.
Iron Hydride Complexes Bearing Phosphinite-Based Pincer Ligands: Synthesis, Reactivity, and Catalytic Application in Hydrosilylation Reactions
作者:Papri Bhattacharya、Jeanette A. Krause、Hairong Guan
DOI:10.1021/om2005589
日期:2011.9.12
bis(phosphinite) ligands 1,3-(R2PO)2C6H4 (R = iPr and Ph) with Fe(PMe3)4 furnishes iron POCOP-pincer hydride complexes [2,6-(R2PO)2C6H3]Fe(H)(PMe3)2 (R = iPr, 1a; R = Ph, 1b) with two PMe3cis to each other. The isopropyl complex 1a undergoes ligand substitution upon mixing with CO to give [2,6-(iPr2PO)2C6H3]Fe(H)(PMe3)(CO). The kinetic product (2a) of this process contains a CO ligand trans to the hydride
用Fe(PMe 3)4处理间苯二酚衍生的双(次膦酸酯)配体1,3-(R 2 PO)2 C 6 H 4(R = i Pr和Ph)提供铁POCOP-钳式氢化物络合物[2,6 -(R 2 PO)2 C 6 H 3 ] Fe(H)(PMe 3)2(R = i Pr,1a ; R = Ph,1b),两个PMe 3彼此顺式。异丙基配合物1a与CO混合后进行配体取代,得到[2,6-(i Pr2 PO)2 C 6 H 3 ] Fe(H)(PMe 3)(CO)。该过程的动力学产物(2a)包含反过来为氢化物的CO配体,而热力学产物(2a')具有氢化物为顺式的CO配体。CO在2a中置换PMe 3在高温下进行,导致形成[2,6-(i Pr 2 PO)2 C 6 H 3 ] Fe(H)(CO)2(3a)。这些新型的POCOP铁-夹杂物氢化铁络合物催化具有不同官能团的醛和酮的氢化硅烷化反应,而1a是该过程中最有效的催
Primary Alcohols via Nickel Pentacarboxycyclopentadienyl Diamide Catalyzed Hydrosilylation of Terminal Epoxides
作者:Keri A. Steiniger、Tristan H. Lambert
DOI:10.1021/acs.orglett.1c03029
日期:2021.10.15
efficient and regioselective hydrosilylation of epoxides co-catalyzed by a pentacarboxycyclopentadienyl (PCCP) diamide nickel complex and Lewis acid is reported. This method allows for the reductive opening of terminal, monosubstituted epoxides to form unbranched, primaryalcohols. A range of substrates including both terminal and nonterminal epoxides are shown to work, and a mechanistic rationale
The copper-catalyzed asymmetric hydrosilylation of ketones is an efficient method for the synthesis of chiral enantiopure secondary alcohols. Herein, we present a detailed computational study (DFT/B3LYP) of the copper(I)-catalyzed reaction. In particular, the two transition states involved in the catalytic cycle have been determined. The insertion of the ketone into the Cu-H bond was found to have
Herein we report a novel Cu-catalyzed regioselective C2–H alkylation of benzimidazoles with aromatic alkenes. The reaction features exclusive regioselectivity and broad substrate scope in the intermolecular alkylation of benzimidazoles with terminal and internal aromatic alkenes, constituting a modular access toward benzimidazole-containing 1,1-di(hetero)aryl alkanes. The intramolecular C2–H alkylation