Synthesis of Piperazinones, Piperazines, Tetrahydropyrazines, and Dihydropyrazinones from Polymer-Supported Acyclic Intermediates via N-Alkyl- and N-Acyliminiums
procedure from easily accessible polymer-supported acyclic precursors containing either a masked aldehyde or ketone group. Acid-mediated unmasking of the aldehyde triggered cyclic iminium formation followed by reduction with triethylsilane present in the cleavage cocktail. The effect of the substituent at the iminium-forming nitrogen was evaluated: whereas complete conversion to the target compounds was
三取代的哌嗪酮、哌嗪、四氢吡嗪和二氢吡嗪酮通过一步法从含有掩蔽醛或酮基团的聚合物支撑的无环前体中制备。酸介导的醛的暴露引发了环状亚胺的形成,然后用裂解混合物中存在的三乙基硅烷进行还原。评估了亚胺形成氮上取代基的影响:虽然观察到 N-烷基、芳基和苯磺酰胺衍生物完全转化为目标化合物,但 N-酰基化合物的醛部分还原为醇. 类似地,酮容易为环状亚胺提供 N-烷基化合物,而它们与 N-酰基前体的环化则不情愿地进行。有趣的是,在三乙基硅烷的存在下,在 60 °C 下树脂结合的无环前体的裂解导致酰胺键分解并形成内酯。类似的合成路线也成功地用于制备哌嗪,并作为合成二氮杂卓的替代路线进行了测试。
4-Azaindole Derivatives
申请人:Eisai R&D Management Co., Ltd.
公开号:US20150094328A1
公开(公告)日:2015-04-02
4-Azaindole derivatives which are modulators of muscarinic acetylcholine receptor (mAChR) M1 and which may be effective for the prevention or disease modifying or symptomatic treatment of cognitive deficits associated with neurological disorders such as Alzheimer-type dementia (AD) or dementia with Lewy bodies (DLB), and a pharmaceutical composition comprising a 4-azaindole derivative as an active ingredient.
Indole, azaindole and related heterocyclic 4-alkenyl piperidine amides
申请人:——
公开号:US20040063744A1
公开(公告)日:2004-04-01
This invention provides compounds having drug and bio-affecting properties, their pharmaceutical compositions and method of use. In particular, the invention is concerned with new piperidine 4-alkenyl derivatives that possess unique antiviral activity. More particularly, the present invention relates to compounds useful for the treatment of HIV and AIDS. The compounds of the invention for the general Formula I:
1
wherein:
Z is
2
Q is selected from the group consisting of:
3
—W— is
4
Remarkably Efficient Synthesis of 2<i>H</i>-Indazole 1-Oxides and 2<i>H</i>-Indazoles via Tandem Carbon−Carbon Followed by Nitrogen−Nitrogen Bond Formation
followed by nitrogen-nitrogen bond formations quantitatively converted N-alkyl-2-nitro-N-(2-oxo-2-aryl-ethyl)-benzenesulfonamides to 2H-indazoles 1-oxides under mild conditions. Triphenylphosphine or mesylchloride/triethylamine-mediated deoxygenation afforded 2H-indazoles.
Polymer-Supported Stereoselective Synthesis of (1<i>S</i>,5<i>S</i>)-6-Oxa-3,8-diazabicyclo[3.2.1]octanes
作者:Eva Schütznerová、Allen G. Oliver、Jaroslav Zajíček、Viktor Krchňák
DOI:10.1002/ejoc.201300093
日期:2013.5
We describe a polymer-supported stereoselectivesynthesis of the (1S,5S)-6-oxa-3,8-diazabicyclo[3.2.1]octane-bridged scaffold by tandem iminium ion cyclization/nucleophilic addition reactions. A series of resin-bound acyclic intermediates bearing different substituents were prepared, and the scope and limitations of the chemical route leading to the bridged scaffold were evaluated. The Thr-derived
我们描述了聚合物支持的立体选择性合成 (1S,5S)-6-oxa-3,8-二氮杂双环 [3.2.1] 辛烷桥支架,通过串联亚胺离子环化/亲核加成反应。制备了一系列带有不同取代基的树脂结合无环中间体,并评估了导致桥接支架的化学途径的范围和局限性。发现 Thr 衍生的桥接支架在酸中比 Ser 衍生的支架更稳定,后者部分转化为二氢吡嗪酮。在形成亚胺的氮上的取代对酸稳定性至关重要,具有吸电子基团的 N-芳基磺酰胺通过酸介导的裂解产生最高纯度的粗产物。