Probes for Narcotic Receptor-Mediated Phenomena. 25. Synthesis and Evaluation of N-Alkyl-Substituted (α-Piperazinylbenzyl)benzamides as Novel, Highly Selective δ Opioid Receptor Agonists
摘要:
A series of N-alkyl- and N,N-dialkyl-4-[alpha-{(2S,5R)-4-allyl-2,5-dimethyl-1-piperazinyl}benzyl]-benzamides were synthesized and evaluated for binding affinities at mu, delta, and kappa opioid receptor subtypes. Several compounds (2e,f,h,i,m) strongly bound to the delta receptor with IC50 values in the nanomolar range. On the other hand, the binding affinities of these compounds for the mu and kappa receptors were in the micromolar or greater range indicating excellent delta opioid receptor subtype selectivities. In this series, two important structure-activity relationships were found for the delta receptor binding affinity. First, the spatial orientation of the alpha-benzylic position influenced the affinities with the alpha R derivatives 2a-n generally showing more than 10-fold greater affinity than the alpha S derivatives 3a-n. Second, the binding affinities were strongly influenced by the number of alkyl substituents on the amide nitrogen. N-Monoalkylbenzamide derivatives 2b-d showed lower affinity than N,N-dialkylbenzamide derivatives 2e-n, and the N-unsubstituted benzamide derivative 2a had the lowest affinity for the delta receptor in the series. The dramatic effect of the amide group substitution pattern on the binding affinity for the delta receptor strongly suggests that the amide function is an important structural element in the interaction of this series of compounds at the delta receptor. Selective compounds in this series were examined for binding affinity in cloned human mu and delta receptors. The results obtained generally paralleled those from the rat brain binding assay. Compounds 2e,f with potent delta binding affinities and high delta selectivities were shown to be delta agonists with high selectivity by studies in the guinea pig ileum (GPI) and mouse vas deferens (MVD) preparations. Compound 2f was the most selective compound in the rat brain and GPI/MVD assays with 1755- and 958-fold delta vs mu selectivity, respectively.
Probes for Narcotic Receptor-Mediated Phenomena. 25. Synthesis and Evaluation of N-Alkyl-Substituted (α-Piperazinylbenzyl)benzamides as Novel, Highly Selective δ Opioid Receptor Agonists
摘要:
A series of N-alkyl- and N,N-dialkyl-4-[alpha-{(2S,5R)-4-allyl-2,5-dimethyl-1-piperazinyl}benzyl]-benzamides were synthesized and evaluated for binding affinities at mu, delta, and kappa opioid receptor subtypes. Several compounds (2e,f,h,i,m) strongly bound to the delta receptor with IC50 values in the nanomolar range. On the other hand, the binding affinities of these compounds for the mu and kappa receptors were in the micromolar or greater range indicating excellent delta opioid receptor subtype selectivities. In this series, two important structure-activity relationships were found for the delta receptor binding affinity. First, the spatial orientation of the alpha-benzylic position influenced the affinities with the alpha R derivatives 2a-n generally showing more than 10-fold greater affinity than the alpha S derivatives 3a-n. Second, the binding affinities were strongly influenced by the number of alkyl substituents on the amide nitrogen. N-Monoalkylbenzamide derivatives 2b-d showed lower affinity than N,N-dialkylbenzamide derivatives 2e-n, and the N-unsubstituted benzamide derivative 2a had the lowest affinity for the delta receptor in the series. The dramatic effect of the amide group substitution pattern on the binding affinity for the delta receptor strongly suggests that the amide function is an important structural element in the interaction of this series of compounds at the delta receptor. Selective compounds in this series were examined for binding affinity in cloned human mu and delta receptors. The results obtained generally paralleled those from the rat brain binding assay. Compounds 2e,f with potent delta binding affinities and high delta selectivities were shown to be delta agonists with high selectivity by studies in the guinea pig ileum (GPI) and mouse vas deferens (MVD) preparations. Compound 2f was the most selective compound in the rat brain and GPI/MVD assays with 1755- and 958-fold delta vs mu selectivity, respectively.
Rhodium-Catalyzed Oxidative <i>ortho</i>-Acylation of Benzamides with Aldehydes: Direct Functionalization of the sp<sup>2</sup> C–H Bond
作者:Jihye Park、Eonjeong Park、Aejin Kim、Youngil Lee、Ki-Whan Chi、Jong Hwan Kwak、Young Hoon Jung、In Su Kim
DOI:10.1021/ol201729w
日期:2011.8.19
A rhodium-catalyzedoxidative acylation of benzamides with aryl aldehydes via direct sp2 C–Hbond cleavage is described. In the presence of [Cp*RhCl2]2, AgSbF6, and silver carbonate as an oxidant, N,N-diethyl benzamides can be effectively carbonylated to yield ortho-acyl benzamides.
A Novel Aromatic Electrophilic Substitution: Acylation of Aromatics with Cyclic Isoimidium Salts to Yield<i>N,N</i>-Disubstituted β-Aroylcarboxamides
作者:Alexandru R. Balaban、Theodor-Silviu Balaban、Gerhard V. Boyd
DOI:10.1055/s-1987-28012
日期:——
Cyclic isoimidium perchlorates derived from N,N-diethylphthalamic acid and the monomorpholides of succinic and maleic acid react with benezene, toluene or anisole in the presence of aluminium chloride to give the corresponding ß-aroylcarboxamides in moderate yields.
Rapid synthesis of isoquinolinones by intramolecular coupling of amides and ketones
作者:Wen-Tao Wei、Yu Liu、Lin-Miao Ye、Rong-Hui Lei、Xue-Jing Zhang、Ming Yan
DOI:10.1039/c4ob01948b
日期:——
Isoquinolinones were prepared in good yieldsviathe intramolecular coupling of amides and ketones in the presence of KOt-Bu/DMF.
通过在存在KOt-Bu/DMF的情况下,酰胺和酮的分子内偶联反应,制备了优良产率的异喹啉酮。
A comparison of secondary and tertiary amides as directors of ortho and adjacent benzylic lithiation and of asymmetric induction in ortho lithiated benzamides
Comparisons are made between the influence of secondary and tertiary amides on ortho and adjacent benzylic metallations of benzamides. In the intramolecular competition offered by N,N-diethyl-N-ethylterephthalamide (1) the tertiary amide is the more effective director of ortho lithiation, while the secondary amide is better in the intermolecular competitions offered by the pairs N-ethyl-(9): N,N-diethylbenzamide(10)