Ultrasound assisted one-pot synthesis of benzo-fused indole-4,9-dinones from 1,4-naphthoquinone and α-aminoacetals
摘要:
A one-pot synthesis of benzo[f]indole-4,9-diones from 1,4-naphthoquinone with alpha-aminoacetals has been developed. This method provides a straightforward synthesis of benzo[f]indole-4,9-diones via intramolecular nucleophilic attack of aminoquinones to aldehydes under mild reaction conditions. The detailed mechanism was also investigated. (C) 2016 Elsevier Ltd. All rights reserved.
Multisubstrate inhibitors of dopamine .beta.-hydroxylase. 2. Structure-activity relationships at the phenethylamine binding site
摘要:
1-Aralkylimidazole-2-thiones have been shown to be potent multisubstrate inhibitors of dopamine beta-hydroxylase (DBH; EC 1.14.17.1). In the present study, a series of 1-benzylimidazole-2-thiones was prepared to explore the effects of substitution in the benzyl ring on the inhibition of DBH. A detailed structure-activity relationship for in vitro activity was discovered and this was shown by a modified Hansch analysis to correlate (r = 0.91) with four key structural features of the benzyl ring: the presence of a hydroxyl at the 4-position, molar refractivity at the 3-, 4-, and 5-positions, inductive effects of the substituents at the 3-, 4-, and 5-positions, and pi-electron density. The affinity (Kis) of eight substituted inhibitors for DBH was shown to correlate (r = 0.75) with the affinity (KD) of comparably substituted tyramines for the ternary DBH-oxygen-tyramine complex. This correlate is used to support the hypothesis that binding of inhibitor to DBH occurs in a fashion that mimics the binding of tyramine substrates. The most potent inhibitors were selected for study in vivo in the spontaneously hypertensive rat model of hypertension. The changes in vascular dopamine and norepinephrine levels that resulted from oral administration of the inhibitors corresponded to the observed reduction in mean arterial blood pressure. A divergence between in vitro potency and in vivo efficacy upon oral dosing was noted and is suggested to result from an in vivo metabolic conjugation of the phenolic group of inhibitor.
proteins are overexpressed in many cancers and implicated in tumor growth, so the development of antagonist that disrupts with the binding of IAP to their partner protein is a promising therapeutic strategy. In an effort to increase cellular activity and improve favorable drug-like properties, we newly designed and synthesized monovalent analogues based on imidazopyrazinone structure of 9. Optimization
Synthesis of tetrahydroisoquinolines through TiCl4-mediated cyclization and Et3SiH reduction
作者:Zeyu Shi、Qiong Xiao、Dali Yin
DOI:10.1016/j.cclet.2019.09.023
日期:2020.3
Abstract A versatile and efficient telescoped reaction sequence for the synthesis of tetrahydroisoquinolines (THIQs) is reported that uses TiCl4 to promote cyclization of a benzylaminoacetal derivative and Et3SiH for reduction of the intermediate 4-hydroxy-THIQ. This method is complimentary to the classical Pomeranz-Fritsch and related reactions since it tolerates electron-withdrawing substituents
Cu(II)-Catalyzed Construction of Heterobiaryls using 1-Diazonaphthoquinones: A General Strategy for the Synthesis of QUINOX and Related P,N Ligands
作者:Aniruddha Biswas、Subarna Pan、Rajarshi Samanta
DOI:10.1021/acs.orglett.2c00127
日期:2022.3.4
was developed for the synthesis of heterobiaryls using easily available N-oxides and diazonaphthoquinones under cheap Cu(II) catalysis. The developed method offered QUINOX and related congeners in a simple manner. A wide scope of important heterobiaryls was achieved with high site selectivity. The synthesized naphthols were transformed into the privileged related P,N ligands. Suitable resolution methods
A new methodology to afford α-amino nitriles through oxidative cyanomethylation of amines using nitromethane as the methylene source in the presence of Me3SiCN without the addition of an external oxidant was developed. A catalytic amount of AgCN and a stoichiometric amount of LiBF4 cooperatively promoted the transformation. A wide variety of the amines, including both aromatic compounds and aliphatic
开发了一种在 Me 3 SiCN存在下,在不添加外部氧化剂的情况下,使用硝基甲烷作为亚甲基源,通过胺的氧化氰甲基化来提供 α-氨基腈的新方法。催化量的AgCN和化学计量量的LiBF 4协同促进转化。多种胺,包括芳香族化合物和脂肪族胺,在氧化条件下不稳定,适用于该反应。
Ultrasound assisted one-pot synthesis of benzo-fused indole-4,9-dinones from 1,4-naphthoquinone and α-aminoacetals
作者:Quang H. Luu、Jorge D. Guerra、Cecilio M. Castañeda、Manuel A. Martinez、Jong Saunders、Benjamin A. Garcia、Brenda V. Gonzales、Anushritha R. Aidunuthula、Shizue Mito
DOI:10.1016/j.tetlet.2016.04.031
日期:2016.5
A one-pot synthesis of benzo[f]indole-4,9-diones from 1,4-naphthoquinone with alpha-aminoacetals has been developed. This method provides a straightforward synthesis of benzo[f]indole-4,9-diones via intramolecular nucleophilic attack of aminoquinones to aldehydes under mild reaction conditions. The detailed mechanism was also investigated. (C) 2016 Elsevier Ltd. All rights reserved.