Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 4. Stepwise construction of terminal 1, 3-diynes, conjugated diacetylenic esters and a triacetylenic ester
摘要:
Thirteen examples of stabilised alkynoyl ylides 6 have been prepared and are found, upon flash vacuum pyrolysis (FVP) at 500 degrees C, to undergo extrusion of Ph(3)PO to give the diacetylenic esters 7 in moderate yield. At 750 degrees C the same ylides afforded terminal 1.3-diynes 8 although often in poor yield. For R = 2-MeSC(6)H(4) both 7 and 8 undergo secondary loss of Me(.) and cyclisation to give 2-alkynylbenzothiophene derivatives 9 and 10 in low yield. The first example of an alkadiynoyl ylide 11 has been prepared and is converted by FVP at 500 degrees C into the triacetylenic ester 12.
Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 4. Stepwise construction of terminal 1, 3-diynes, conjugated diacetylenic esters and a triacetylenic ester
摘要:
Thirteen examples of stabilised alkynoyl ylides 6 have been prepared and are found, upon flash vacuum pyrolysis (FVP) at 500 degrees C, to undergo extrusion of Ph(3)PO to give the diacetylenic esters 7 in moderate yield. At 750 degrees C the same ylides afforded terminal 1.3-diynes 8 although often in poor yield. For R = 2-MeSC(6)H(4) both 7 and 8 undergo secondary loss of Me(.) and cyclisation to give 2-alkynylbenzothiophene derivatives 9 and 10 in low yield. The first example of an alkadiynoyl ylide 11 has been prepared and is converted by FVP at 500 degrees C into the triacetylenic ester 12.
Alkynyl Acylammoniums as Electrophilic 3C Synthons in a Formal [3 + 3] Annulation: Access to Functionalized 4<i>H</i>-Pyran-4-ones
作者:Shuding Dong、Chao Fang、Weifang Tang、Tao Lu、Ding Du
DOI:10.1021/acs.orglett.6b01891
日期:2016.8.5
acylammoniums generated in situ from alkynyl acids are first used as electrophilic 3C synthons in a formal [3 + 3] annulation with 1,3-dicarbonyl compounds for regioselective synthesis of functionalized 4H-pyran-4-ones via a 4-(dimethylamino)pyridine/Lewis acid dual-activation strategy. This protocol paves the way for further investigation of alkynyl acylammoniums as 3C synthons for construction of diverse heterocyclic
[DE] SUBSTITUIERTE 1-PROPIOLYL-PIPERAZINE MIT AFFINITÄT FÜR DEN MGLUR5 REZEPTOR ZUR BEHANDLUNG VON SCHMERZZUSTÄNDEN<br/>[EN] SUBSTITUTED 1-PROPIOLYLPIPERAZINES HAVING AN AFFINITY FOR THE MGLUR5 RECEPTOR IN ORDER TO TREAT PAINFUL CONDITIONS<br/>[FR] 1-PROPIOLYLPIPERAZINES SUBSTITUEES PRESENTANT UNE AFFINITE POUR LE RECEPTEUR MGLUR5, UTILISEES POUR LE TRAITEMENT DE DOULEURS
申请人:GRUENENTHAL GMBH
公开号:WO2006002981A1
公开(公告)日:2006-01-12
Die vorliegende Erfindung betrifft substituierte 1-Propiolyl-piperazine gemäss Formel (I), Verfahren zu ihrer Herstellung, Arzneimittel enthaltend diese Verbindungen sowie deren Verwendung zur Herstellung von Arzneimitteln. (I), worin X für N oder C-R2 steht und n einem Wert zwischen 0-8 entspricht.
Highly
<i>E</i>
‐Selective and Enantioselective Michael Addition to Electron‐Deficient Internal Alkynes Under Chiral Iminophosphorane Catalysis
作者:Daisuke Uraguchi、Kohei Yamada、Takashi Ooi
DOI:10.1002/anie.201503928
日期:2015.8.17
A highly E‐selective and enantioselective conjugate addition of 2‐benzyloxythiazol‐5(4H)‐ones to β‐substituted alkynyl N‐acyl pyrazoles is achieved under the catalysis of a P‐spiro chiral iminophosphorane. Simultaneous control of the newly generated central chirality and olefin geometry is possible with a wide array of the alkynyl Michael acceptors possessing different aromatic and aliphatic β‐substituents
Cu-Catalyzed Oxidative Amidation of Propiolic Acids Under Air via Decarboxylative Coupling
作者:Wei Jia、Ning Jiao
DOI:10.1021/ol1004615
日期:2010.5.7
A Cu-catalyzed aerobic oxidative amidation of propiolicacids via decarboxylation under air has been developed. Only carbon dioxide is produced as byproduct in this approach. The use of air as oxidant makes this method more useful and easy to handle.