Pd-Catalyzed Silicon Hydride Reductions of Aromatic and Aliphatic Nitro Groups
作者:Ronald J. Rahaim、Robert E. Maleczka
DOI:10.1021/ol052120n
日期:2005.10.1
[reaction: see text] Room-temperature reduction of aromaticnitrogroups to amines can be accomplished in high yield, with wide functional group tolerance and short reaction times (30 min) using a combination of palladium(II) acetate, aqueous potassium fluoride, and polymethylhydrosiloxane (PMHS). Replacing PMHS/KF with triethylsilane allows aliphatic nitrogroups to be reduced to their hydroxylamines.
Palladium-Catalyzed Silane/Siloxane Reductions in the One-Pot Conversion of Nitro Compounds into Their Amines, Hydroxylamines, Amides, Sulfonamides, and Carbamates
作者:Robert Maleczka、Ronald Rahaim
DOI:10.1055/s-2006-950231
日期:——
A combination of palladium(II) acetate, aqueous potassi- um fluoride, and polymethylhydrosiloxane (PMHS) facilitates the room-temperature reduction of aromatic nitro compounds to anilines. These reactions tend to be quick (30 min), high-yielding, and tolerate a range of other functional groups. Replacement of PMHS/KF with triethylsilane allows for the reduction of aliphatic nitro compounds to their
The present invention relates to substituted hydroxyureas. These compounds inhibit the enzyme 5-lipoxygenase. In addition, certain of the compounds also inhibit the enzyme-cyclooxygenase. The compounds are useful for treating asthma, allergies, arthritis, posoriasis, ischemia, dermatitis, inflammation and/or broncho-constriction and/or inflammatory diseases of the eye.
Synthesis, chemical, and biological properties of vinylogous hydroxamic acids: dual inhibitors of 5-lipoxygenase and IL-1 biosynthesis
作者:Stephen W. Wright、Richard R. Harris、Janet S. Kerr、Alicia M. Green、Donald J. Pinto、Elaine M. Bruin、Robert J. Collins、Roberta L. Dorow、Lisa R. Mantegna
DOI:10.1021/jm00100a011
日期:1992.10
of each being dependent upon the structure of the VHA, solvent, and pH. VHAs undergo some of the typical reactions of hydroxamic acids as well as those of vinylogous amides. VHAs are active as inhibitors of 5-lipoxygenase and of IL-1 biosynthesis in vitro, which do not inhibit other enzymes of the arachidonic acid cascade. They have been shown by ESR studies to bring about inhibition of soybean type
substrate specificity for 5-lipoxygenase and the known stereochemical course of the reaction, a hypothetical model of the enzyme active site was developed and used to design 2 types of selective inhibitors of 5-lipoxygenase. Both inhibitor types used aromatic rings in place of (Z)-olefins of the substrate and were designed to mimic the nonpolar end of arachidonic acid. One inhibitor type used a carboxylic-acid