Amides and ketones are fluorinated or hydroxylated in HF-SbF5 in the presence of CCl4 or NBS, reaction occurring at a carbon far located from the functional group.
Reaction of cyclic ketones 2–6 and imines 15–17 in HF/SbF5 in presence of CCl4 yield hydroxy or fluoroderivatives, hydride abstraction occurring at a site located far from the functional group. Whereas ketones 2–5 yield only hydroxy derivatives, through cyclic carboxonium ion, imines 15, 16 N-protonated in the media conditions give only fluoroderivatives 18, 19, respectively, after quenching with HF–pyridine
Cyclic Ether Synthesis via Palladium-Catalyzed Directed Dehydrogenative Annulation at Unactivated Terminal Positions
作者:Samuel J. Thompson、Danny Q. Thach、Guangbin Dong
DOI:10.1021/jacs.5b07384
日期:2015.9.16
Here, a palladium-catalyzed functionalization of unactivated sp(3) C-H bonds with internal alcohol nucleophiles is described. Directed by an oxime-masked alcohol, annulation chemoselectively occurs at the β position, leading to a range of aliphatic cyclic ethers with four- to seven-membered rings. Tethered primary, secondary, and tertiary free hydroxyl groups can all react to give the corresponding
Dialkylaluminum <i>N</i>,<i>O</i>-Dimethylhydroxylamine Complex as a Reagent to Mask Reactive Carbonyl Groups in Situ from Nucleophiles
作者:Francis J. Barrios、Xuechao Zhang、David A. Colby
DOI:10.1021/ol102495v
日期:2010.12.3
mask carbonylgroups in situ from nucleophilic addition by organolithiums, Grignard reagents, and borohydrides. The utility of this process by selectively adding nucleophiles into carbonylgroups on a variety of structures as well as distinguishing between carbonylgroups on a sensitive natural product is demonstrated. 1H NMR analysis supports the in situ masking of the more reactivecarbonyl group
N,O-二甲基羟胺的铝络合物是有效掩盖羰基的有效试剂,可防止有机锂,格氏试剂和硼氢化物的亲核加成。通过选择性地将亲核试剂添加到各种结构的羰基中以及区分敏感的天然产物上的羰基,证明了该方法的实用性。1 H NMR分析支持对反应性更高的羰基进行原位掩蔽。
Substituted Azaspiro(4.5)Decane Derivatives
申请人:Gruenenthal GmbH
公开号:US20160016903A1
公开(公告)日:2016-01-21
The invention relates to substituted spirocyclic cyclohexane derivatives which have an affinity for the μ opioid receptor and the ORL1 receptor, processes for the preparation thereof, medicaments containing these compounds and the use of these compounds for the preparation of medicaments.