Superoxide dismutase mimetics. Part 2: synthesis and structure–Activity relationship of glyoxylate- and glyoxamide-Derived metalloporphyrins
摘要:
Novel glyoxylate- and glyoxamide-derived metalloporphyrins 26-58 were synthesized and evaluated as potential superoxide dismutase (SOD) mimetics. Relative to previously studied MnTBAP analogues, the glyoxylate-derived metalloporphyrins 32, 39, and 54 and glyoxamide-derived metalloporphyrin 49, exhibited enhanced activity in the SOD assay and the majority of the analogues in the current series showed enhanced inhibition of lipid peroxidation and catalase activity. (C) 2003 Elsevier Science Ltd. All rights reserved.
Periselective and enantioselective carbonyl–ene reaction of isoprene with fluoroalkyl glyoxylate catalysed by modified binaphthol–titanium complex: asymmetric catalytic synthesis of enantiomerically pure ipsdienol
作者:Masahiro Terada、Koichi Mikami
DOI:10.1039/c39950002391
日期:——
The asymmetric reaction of trifluoroethyl glyoxylate 3d with isoprene 4 catalysed by the modified binaphtholâtitanium complex 2b provides the ene product 5d in high periselectivity (92%) and complete enantioselectivity, which can be converted to ipsdienol 1, a component of the aggregation pheromone of the bark beetle, genus lps, in enantiomerically pure form.
A Multistage, One-Pot Procedure Mediated by a Single Catalyst: A New Approach to the Catalytic Asymmetric Synthesis of β-Amino Acids
作者:Ahmed M. Hafez、Travis Dudding、Ty R. Wagerle、Meha H. Shah、Andrew E. Taggi、Thomas Lectka
DOI:10.1021/jo034150e
日期:2003.7.1
A catalytic asymmetric procedure for the preparation of beta-amino acids (specifically beta-substituted aspartic acid derivatives) is reported. The cinchona alkaloid catalyst benzoylquinine (BQ) mediates up to five distinct steps of a reaction pathway, all in one reaction vessel. The products of this reaction, highly optically enriched beta-substituted aspartic acid derivatives, were prepared from
The present invention relates, in general, to a method of modulating physiological and pathological processes and, in particular, to a method of modulating cellular levels of oxidants and thereby processes in which such oxidants are a participant. The invention also relates to compounds and compositions suitable for use in such methods. Compounds of the invention include those of Formula I.
Superoxide dismutase mimetics. Part 2: synthesis and structure–Activity relationship of glyoxylate- and glyoxamide-Derived metalloporphyrins
作者:Michael P Trova、Polivina Jolicia F Gauuan、Anthony D Pechulis、Stephen M Bubb、Stephen B Bocckino、James D Crapo、Brian J Day
DOI:10.1016/s0968-0896(03)00272-4
日期:2003.7
Novel glyoxylate- and glyoxamide-derived metalloporphyrins 26-58 were synthesized and evaluated as potential superoxide dismutase (SOD) mimetics. Relative to previously studied MnTBAP analogues, the glyoxylate-derived metalloporphyrins 32, 39, and 54 and glyoxamide-derived metalloporphyrin 49, exhibited enhanced activity in the SOD assay and the majority of the analogues in the current series showed enhanced inhibition of lipid peroxidation and catalase activity. (C) 2003 Elsevier Science Ltd. All rights reserved.
Catalytic and Enantioselective Diels–Alder Reactions of (<i>E</i>)-4-Oxopent-2-enoates
作者:Su-Lei Zhang、Yong Lu、Yuan-He Li、Kuang-Yu Wang、Jia-Hua Chen、Zhen Yang
DOI:10.1021/acs.orglett.7b01692
日期:2017.8.4
Novel oxazaborolidines activated by the strong acid triflimide or AlBr3 form cationic chiral catalysts. These are effective catalysts for highly regio- and enantioselective Diels–Alder reactions using substituted (E)-4-oxopent-2-enoates as dienophiles.