selectivity profile towards the hH2R, e.g. 157 being at least 3800-fold selective within the histamine receptor family. The structural similarities of our monomeric ligands to pramipexole (6), a dopamine receptoragonist, suggested an investigation of the binding behavior at those receptors. The target compounds were (partial) agonists with moderate affinity at the hD2longR and agonists with high affinity
即使在今天,组胺H 2受体(H 2 R)在中枢神经系统(CNS)中的作用仍然广为人知。在先前的研究中,许多二聚体,高亲和力和亚型选择性的氨基甲酰基胍型配体,例如UR-NK22(5,p K i = 8.07)被报道为H 2 R激动剂。但是,它们在中枢神经系统中研究H 2 R的适用性因其分子和药代动力学特性(例如高分子量)而受到限制,因此其生物利用度有限。满足对更多类似毒品的H 2的需求R激动剂具有高亲和力,我们合成了一系列含有各种间隔基和侧链部分的单体(硫代)氨基甲酰基胍型配体。这种结构上的简化导致了有效的(部分)激动剂(豚鼠右心房,[ 35 S]GTPγS和β-arrestin2募集试验),其人类(h)H 2 R亲和力在一位纳摩尔范围内(p K i(139,UR-KAT523):8.35; p K i(157,UR-MB-69):8.69)。本文介绍的大多数化合物对hH 2 R表现出出色
Rhodium-Catalyzed Beckmann Rearrangement
作者:Mieko Arisawa、Masahiko Yamaguchi
DOI:10.1021/ol006951z
日期:2001.1.1
[figure: see text] Beckmann rearrangement of oxime is catalyzed by [RhCl(cod)]2, trifluoromethanesulfonic acid, and tris(p-tolyl)phosphine in refluxing dichloroethane, giving the corresponding amide in good yield. Product/acid ratios of 10:20 can be attained in the reaction of benzophenone oximes.
organocatalytic Beckmannrearrangement of ketoximes into amides has been realized by the catalytic use of cyanuric chloride. Furthermore, acids such as HCl and ZnCl2 are effective as cocatalysts with cyanuric chloride. For example, azacyclotridecan-2-one, which is synthetically useful as a starting material for nylon-12, was prepared in quantitative yield by the Beckmannrearrangement of cyclododecanone
Beckmann Rearrangement of Oximes under Very Mild Conditions
作者:Lidia De Luca、Giampaolo Giacomelli、Andrea Porcheddu
DOI:10.1021/jo025960d
日期:2002.8.1
A variety of ketoximes, easily prepared from the corresponding ketones, undergo the Beckmann rearrangement upon treatment with 2,4,6-trichloro[1,3,5]triazine in N,N-dimethylformamide at room temperature in excellent yields. This procedure can be applied to aldoximes for obtaining the corresponding nitriles.
Photocatalyzed Triplet Sensitization of Oximes Using Visible Light Provides a Route to Nonclassical Beckmann Rearrangement Products
作者:Xiao Zhang、Tomislav Rovis
DOI:10.1021/jacs.1c10148
日期:2021.12.22
photoisomerization of oximes via visible-light-mediated energy transfer (EnT) catalysis. Facile access to (Z)-oximes provides opportunities to achieve regio- and chemoselectivity complementary to those of widely used transformations employing oxime starting materials. We show an enhanced one-pot protocol for photocatalyzed oxime isomerization and subsequent Beckmannrearrangement that enables novel reactivity with