Regioselective Epoxidations by Cytochrome P450 3A4 Using a Theobromine Chemical Auxiliary to Predictably Produce N-Protected β- or γ-Amino Epoxides
作者:Vanja Polic、Kin Jack Cheong、Fabien Hammerer、Karine Auclair
DOI:10.1002/adsc.201700637
日期:2017.11.23
N-Protected β- and γ-aminoepoxides are useful chiral synthons. We report here that the enzyme cytochrome P450 3A4 can catalyze the formation of such compounds in a regio- and stereoselective manner, even in the presence of multiple double bonds or aromatic substituents. To this end, the theobromine chemical auxiliary is used not only to control the selectivity of the enzyme, but also as a masked amine
The first intramolecular silene Diels–Alder reactions
作者:Michal Czyzewski、Jonathan D. Sellars、Tamaz Guliashvili、Julius Tibbelin、Lisa Johnstone、Justin Bower、Matthew Box、Robert D. M. Davies、Henrik Ottosson、Patrick G. Steel
DOI:10.1039/c3cc49526d
日期:——
The synthesis of silaheterocycles through the first examples of an intramolecular silene DielsâAlder reaction is described.
描述了通过首次实例的分子内硅烯Diels-Alder反应合成硅杂环化合物。
Substituted fused bicyclic amines as modulators of chemokine receptor activity
申请人:Batt G. Douglas
公开号:US20050197373A1
公开(公告)日:2005-09-08
The present application describes modulators of CCR3 of formula (Ia) and (Ib):
or pharmaceutically acceptable salt forms thereof, wherein Z, R
1
, R
2
, R
3
, R
4
, R
5
, R
5
′, R
6
, a, b, c, d, and u are as defined herein. In addition, methods of treating and preventing inflammatory diseases such as asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and atherosclerosis using said modulators are disclosed.
Rhodium-Catalyzed Synthesis of Eight-Membered Rings
作者:Brenton DeBoef、W. Richard Counts、Scott R. Gilbertson
DOI:10.1021/jo0620462
日期:2007.2.1
Experiments to develop a rhodiumcatalyst for the [4 + 2 + 2] cycloisomerization of dienynes with a second alkyne are described. The generality of the reaction is probed in terms of dienyne structure and alkyne structure. A catalystsystem that provides cyclooctatrienes in greater than 70% yield is reported. Several experiments to determine the nature of the catalyst are described.
Studies of Acyl-CoA Dehydrogenase Catalyzed Allylic Isomerization: A One-Base or Two-Base Mechanism?
作者:Srikanth Dakoji、Injae Shin、Donald F. Becker、Marian T. Stankovich、Hung-wen Liu
DOI:10.1021/ja962532e
日期:1996.11.13
capable of catalyzing γ-H abstraction to afford the allylic isomerization between α,β- and β,γ-enone thioesters and/or inactivation by 2- or 3-acetylenic acyl-CoA derivatives. Although a dual role has been proposed for the glutamate residue in both α- and γ-deprotonation, the existence of a second active-site basic group to mediate the observed reactions occurring at γ-C remains a feasible mechanism