Manganese Complexes of Pyrrole‐ and Indolecarboxamide Ligands: Synthesis, Structure, Electrochemistry, and Applications in Oxidative and Lewis‐Acid‐Assisted Catalysis
作者:Sunil Yadav、Sushil Kumar、Rajeev Gupta
DOI:10.1002/ejic.201500773
日期:2015.11
N4 coordination sphere about the MnIII ion. The MnIII complexes of pyrrolecarboxamide ligands are square pyramidal with a fifth Cl atom, whereas analogous complexes of indolecarboxamide ligands are essentially square planar. Electrochemical studies reveal highly negative MnIII/II and moderately positive MnIV/III redox potentials. In situ generated Mn4+ species of the pyrrolecarboxamide ligands were
Multivariate Metal–Organic Frameworks as Multifunctional Heterogeneous Asymmetric Catalysts for Sequential Reactions
作者:Qingchun Xia、Zijian Li、Chunxia Tan、Yan Liu、Wei Gong、Yong Cui
DOI:10.1021/jacs.7b03113
日期:2017.6.21
The search for versatile heterogeneouscatalysts with multiple active sites for broad asymmetric transformations has long been of great interest, but it remains a formidable synthetic challenge. Here we demonstrate that multivariate metal-organicframeworks (MTV-MOFs) can be used as an excellent platform to engineer heterogeneouscatalysts featuring multiple and cooperative active sites. An isostructural
Green Progression for Synthesis of Regioselective β-Amino Alcohols and Chemoselective Alkylated Indoles
作者:Boningari Thirupathi、Rapelli Srinivas、Avvari N. Prasad、J. K. Prashanth Kumar、Benjaram M. Reddy
DOI:10.1021/op1002177
日期:2010.11.19
Solid acid catalysts based on zirconia materials were investigated for the first time as catalysts for regioselective organic synthesis under environmentally benign and mild conditions. The novel TiO2−ZrO2 mixed oxide catalyst led to two distinct products by the formation of an N−C bond (β-aminoalcohols) and a C−C bond (Friedel−Crafts alkylation).
Design and assembly of a chiral composite metal–organic framework for efficient asymmertric sequential transformation of alkenes to amino alcohols
作者:Qingchun Xia、Chen Yuan、Yongxin Li、Yong Cui
DOI:10.1039/c9cc04131a
日期:——
Mn(salen) separately, and then a composite crystal MOF 3 was constructed with 1 inside, which was encapsulated by 2 outside. The resulting composite crystal appeared to be highly enantioselective for the alkene epoxidation/epoxide aminolysis reactions with a maximum ee of 97%.
Résumé The remarkable catalytic activity of BiCl3/SiO2 for the ring-opening of epoxides with aromatic and aliphatic amines under microwave and thermal heating was observed. This eco-friendly heterogeneous catalyst displayed high to excellent regioselectivity in the synthesis of β-amino alcohols under solvent-free conditions. High turnover frequency (TOF) values under microwave heating and excellent reusability of the catalyst may significantly contribute to applied chemistry.