A New Ring-Forming Methodology for the Synthesis of Conformationally Constrained Bioactive Molecules
作者:Demetris P. Papahatjis、Spyros Nikas、Andrew Tsotinis、Margarita Vlachou、Alexandros Makriyannis
DOI:10.1246/cl.2001.192
日期:2001.3
A new, general, one pot method for introducing carbocyclic rings alpha to a nitrile moiety is described. Treatment of readily available arylacetonitriles with potassium bis(trimethylsilyl)amide and subsequent alkylation with α, ω-dibromo or dichloroalkanes in tetrahydrofuran under anhydrous conditions at 0 °C produces cycloalkyl adducts in good yields and short reaction times.
描述了一种新的通用一锅法,用于在腈基前引入碳环。将 readily available 的芳基乙腈与氨基钾双(trimethylsilyl)处理,随后在无水条件下于0 °C的四氢呋喃中与α,ω-二溴或二氯烷烃进行烷基化,可以在短反应时间内以良好的产率生成环烷基附加物。
C1‘-Cycloalkyl Side Chain Pharmacophore in Tetrahydrocannabinols
作者:Demetris P. Papahatjis、Victoria R. Nahmias、Spyros P. Nikas、Thanos Andreou、Shakiru O. Alapafuja、Andrew Tsotinis、Jianxin Guo、Pusheng Fan、Alexandros Makriyannis
DOI:10.1021/jm070121a
日期:2007.8.1
In earlier work we have provided evidence for the presence of a subsite within the CB1 and CB2 cannabinoid receptor binding domains of classical cannabinoids. This putative subsite corresponds to substituents on the C1'-position of the C3-alkyl side chain, a key pharmacophoric feature in this class of compounds. We have now refined this work through the synthesis of additional C1'-cycloalkyl compounds using newly developed approaches. Our findings indicate that the C1'-cyclopropyl and C1'-cyclopentyl groups are optimal pharmacophores for both receptors while the C1'-cyclobutyl group interacts optimally with CB1 but not with CB2. The C1'-cyclohexyl analogs have reduced affinities for both CB1 and CB2. However, these affinities are significantly improved with the introduction of a C2'-C3' cis double bond that modifies the available conformational space within the side chain and allows for a better accommodation of a six-membered ring within the side chain subsite. Our SAR results are highlighted by molecular modeling of key analogs.