3-Substituted gem-cyclohexane sulfone based γ-secretase inhibitors for Alzheimer’s disease: Conformational analysis and biological activity
摘要:
Previously, chemistry effort on the gem-cyclohexane series of gamma-secretase inhibitors has focused on the 4-position of the cyclohexane ring. Recently chemistry has been directed towards the 3-position and substitution here has also provided compounds with high gamma-secretase activity. (c) 2006 Elsevier Ltd. All rights reserved.
Studies on the intramolecular competitive addition of carbon radicals to aldehydo and alkenyl groups
作者:Richard Andrew Walton、Bert Fraser-Reid
DOI:10.1021/ja00015a037
日期:1991.7
Cyclizations of ω-formylalkyl radicals can provide an efficient route to the corresponding cycloalkanols. However, if an ω-vinyl group is present an alternative mode of cyclization exists, and there is competition between cycloalkanol and methyl cycloalkane formation (i.e. (C=O) n versus (C=C) m ). Cyclohexanol formation, (C=O) 6 , usually overwhelms any alternative process, but cyclopentanol and methylcyclopentane
ω-甲酰基烷基的环化可以为相应的环烷醇提供有效的途径。然而,如果存在ω-乙烯基,则存在另一种环化模式,并且环烷醇和甲基环烷烃形成之间存在竞争(即(C=O) n 与(C=C) m )。环己醇的形成,(C=O) 6 ,通常压倒任何替代工艺,但环戊醇和甲基环戊烷工艺((C=O) 5 和 (C=C) 5 )可能具有竞争力。后一个过程涉及经过充分研究的 5-己烯基自由基闭环,因此通过选择合适的底物,其中两种环化模式都是最佳的,我们获得了环戊醇 (C=O) 5 形成的速率数据直接-竞赛实验。kc=O ≥9.6×10 5 s -1 的值与Beckwith和Hay得到的值一致。
Studies on the Mechanism, Selectivity, and Synthetic Utility of Lactone Reduction Using SmI<sub>2</sub> and H<sub>2</sub>O
作者:Dixit Parmar、Lorna A. Duffy、Dhandapani V. Sadasivam、Hiroshi Matsubara、Paul A. Bradley、Robert A. Flowers、David J. Procter
DOI:10.1021/ja906396u
日期:2009.10.28
esters and lactones have long been thought to lie outside the reducing range of SmI(2), activation of the lanthanide reagent by H(2)O allows some of these substrates to be manipulated in an unprecedented fashion. For example, the SmI(2)-H(2)O reducing system shows complete selectivity for the reduction of 6-membered lactones over other classes of lactones and esters. The kinetics of reduction has been
A Ring Size-Selective Reduction of Lactones Using SmI<sub>2</sub> and H<sub>2</sub>O
作者:Lorna A. Duffy、Hiroshi Matsubara、David J. Procter
DOI:10.1021/ja078137d
日期:2008.1.30
The Sml(2)-H2O reducing systems shows complete selectivity for six-membered lactones over other classes of lactone and esters. Experimental and computational studies suggest that the origin of the selectivity lies in the initial electron-transfer to the lactone carbonyl.
3-Substituted gem-cyclohexane sulfone based γ-secretase inhibitors for Alzheimer’s disease: Conformational analysis and biological activity
作者:Richard A. Jelley、Jason Elliott、Karl R. Gibson、Timothy Harrison、Dirk Beher、Earl E. Clarke、Huw D. Lewis、Mark Shearman、Jonathan D.J. Wrigley
DOI:10.1016/j.bmcl.2006.04.019
日期:2006.7
Previously, chemistry effort on the gem-cyclohexane series of gamma-secretase inhibitors has focused on the 4-position of the cyclohexane ring. Recently chemistry has been directed towards the 3-position and substitution here has also provided compounds with high gamma-secretase activity. (c) 2006 Elsevier Ltd. All rights reserved.