Oxidative Cyclizations: The Asymmetric Synthesis of (−)-Alliacol A
摘要:
A tandem anodic coupling-Friedel-Crafts alkylation strategy has been used to rapidly complete the asymmetric synthesis of alliacol A. The anodic oxidation reaction allowed for the generation of a new bond between two nucleophiles. In the synthesis, the absolute stereochemistry of the final natural product is set relative to a methyl group that is incorporated early in the sequence using an asymmetric Michael reaction.
[EN] BENZODIAZEPINE DERIVATIVES AS CCK2/GASTRIN RECEPTOR ANTAGONISTS<br/>[FR] DÉRIVÉS DE BENZODIAZÉPINE À TITRE D'ANTAGONISTES DES RÉCEPTEURS DE CCK2/GASTRINE
申请人:TRIO MEDICINES LTD
公开号:WO2016020698A1
公开(公告)日:2016-02-11
The invention relates to benzodiazepine derivatives of formula (A) useful as CCK2/gastrin receptor antagonists, their preparation and their use in the treatment or prevention of disorders associated with CCK2/gastrin receptors, disorders caused by or associated with hypergastrinaemia, and gastric acid-related disorders.
Reaction ofγ-Hydroxy-N-[1-(dimethylcarbamoyl)ethyl]butanamides under the ‘Direct Amide Cyclization’ Conditions
作者:Boyan Iliev、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200690008
日期:2006.1
the imino lactones was achieved by increasing the substitution in the five-membered ring, and their structure, in the form of the hydrochlorides, was established independently by X-raycrystallography (Fig. 4). A derivative 15 of the imino lactone 12a was prepared by the reaction with the 2H-azirin-3-amine 10a; its structure was also established by an X-ray crystal-structure determination (Fig. 3).
2,2-Disubstituted 4-Acylthio-3-oxobutyl Groups as Esterase- and Thermolabile Protecting Groups of Phosphodiesters
作者:Emilia Kiuru、Zafar Ahmed、Harri Lönnberg、Leonid Beigelman、Mikko Ora
DOI:10.1021/jo302421u
日期:2013.2.1
2-substituents and the size of the acylthio group. The acyl group evidently migrates from the sulfur atom to C3-gem-diol obtained by hydration of the keto group and the exposed mercapto group attacks on C1 resulting in departure of the protectinggroup as 4,4-disubstituted 3-acyloxy-4,5-dihydrothiophene with concomitant release of the desired phosphodiester.
已经引入了五个不同的2,2-二取代的4-酰基硫基-3-氧代丁基作为酯酶不稳定的磷酸二酯保护基,它们另外是热不稳定的。的磷酸三酯1 - 3通过HPLC-ESI-MS制备,以确定在37酶和非酶去除这些基团的速率℃和pH 7.5。另外,1 H NMR光谱监测用于中间体和产物的结构表征。当用猪肝酯酶处理时,这些基团通过酶促脱酰基作用,然后快速化学环化成4,4-二取代的二氢噻吩-3(2 H)-一。可以通过4-酰硫基取代基的性质来调节酶促脱保护的速率,苯甲酰基和乙酰基的去除速度是新戊酰基的50和5倍。酶促脱保护后未观察到谷胱甘肽的烷基化。根据2-取代基的电负性和酰硫基的大小,非酶促脱保护的半衰期为0.57至35小时。酰基显然来自硫原子C3-迁移宝石由酮基的水合和产生保护基团的离去C1上的暴露的巯基的攻击得到二醇如4,4-二取代-3-酰氧基-4,5- -二氢噻吩并伴随释放所需的磷酸二酯。
Synthesis and Stability of Nucleoside 3′,5′-Cyclic Phosphate Triesters Masked with Enzymatically and Thermally Labile Phosphate Protecting Groups
作者:Vyankat A. Sontakke、Vaishali S. Shinde、Harri Lönnberg、Mikko Ora
DOI:10.1002/ejoc.201403227
日期:2015.1
Appropriately protected structurally modified nucleoside 3′,5′-cyclic monophosphates are known to show antiviral activity. For this reason, a straightforward synthesis of nucleoside 3′,5′-cyclic phosphates protected with three different enzymatically removable groups, viz. 3-acetyloxy-2,2-bis(ethoxycarbonyl)propyl (in 1 and 4), 4-acetylthio-2,2-dimethyl-3-oxobutyl (in 2), and 4-(tert-butyldisulfanyl)-2
Compounds Which Selectively Modulate The CB2 Receptor
申请人:BARTOLOZZI Alessandra
公开号:US20100081644A1
公开(公告)日:2010-04-01
Compounds of formula (I) are disclosed. Compounds according to the invention bind to and are agonists, antagonists or inverse agonists of the CB2 receptor, and are useful for treating inflammation. Those compounds which are agonists are additionally useful for treating pain.