通过将羰基官能团转化为烯醇九氟甲磺酸酯中间体,然后消除以得到 CC 三键,从羰基化合物中以良好至极好的分离产率获得了末端和内部乙炔。磷腈碱与温和亲电子的九氟丁烷-1-磺酰氟相结合均匀地诱导了一锅法转化。该方法是迄今为止报道的方法中最通用的,因为它适用于无环酮和醛。只有适度的动力学区域选择性有利于从甲基正烷基酮实现的 alk-1-yne 代表了该方法的局限性。在所有其他情况下,都获得了单独的炔烃产品。
[EN] SUBSTITUTED QUINAZOLINES AS FUNGICIDES<br/>[FR] QUINAZOLINES SUBSTITUÉES, UTILISÉES EN TANT QUE FONGICIDES
申请人:SYNGENTA PARTICIPATIONS AG
公开号:WO2010136475A1
公开(公告)日:2010-12-02
The present invention relates to a compound of formula (I) wherein wherein the substituents have the definitions as defined in claim 1or a salt or a N-oxide thereof, their use and methods for the control and/or prevention of microbial infection, particularly fungal infection, in plants and to processes for the preparation of these compounds.
Ni-Catalyzed Alkenylation of Triazolopyridines: Synthesis of 2,6-Disubstituted Pyridines
作者:Sheng Liu、James Sawicki、Tom G. Driver
DOI:10.1021/ol301606y
日期:2012.7.20
A synthetic strategy to access 2,6-disubstitutedpyridines from triazolopyridines through a regioselective nickel-catalyzed alkenylation reaction of the C7–H bond is described. The N2 fragment embedded in the resulting C–H functionalized triazolopyridine can be readily excised using acidic or oxidative conditions to unmask the pyridine.
Rhodium-Catalyzed Regioselective Domino Azlactone-Alkyne Coupling/Aza-Cope Rearrangement: Facile Access to 2-Allyl-3-oxazolin-5-ones and Trisubstituted Pyridines
作者:Jinqiang Kuang、Shaista Parveen、Bernhard Breit
DOI:10.1002/anie.201704022
日期:2017.7.10
Rhodium‐catalyzedregioselective addition of azlactones to internal alkynes combined with aza‐Cope rearrangement provides efficient atom economic access to 2‐allyl‐3‐oxazolin‐5‐one derivatives. Extension to a triple domino process, in which the above process is combined with in situ azlactone formation starting from amino acids renders this process even more attractive. Subsequent thermolysis of the
Selectivity controllable divergent synthesis of α,β-unsaturated amides and maleimides from alkynes and nitroarenes via palladium-catalyzed carbonylation
A tunable procedure on palladium-catalyzed carbonylative divergent synthesis of α,β-unsaturated amides and maleimides from symmetrical internal alkynes and nitroarenes has been developed. By using Pd(acac)2/dppp/4-ClBSA/DMF and Pd(TFA)2/DPEphos/PTSA/H2O/toluene as the catalytic systems, a range of multi-substituted maleimides and α,β-unsaturated amides were selectively prepared in moderate to good
已开发了一种可调谐程序,可从对称内部炔烃和硝基芳烃上钯催化羰基发散性合成α,β-不饱和酰胺和马来酰亚胺。通过使用Pd(acac)2 / dppp / 4-ClBSA / DMF和Pd(TFA)2 / DPEphos / PTSA / H 2 O /甲苯作为催化体系,一系列多取代的马来酰亚胺和α,β-不饱和酰胺以Mo(CO)6为固体CO源,以硝基芳烃为廉价而丰富的氮源,以中等至良好的收率选择性地制备了这些化合物。
Synthesis of 7-hydroxy-6<i>H</i>-naphtho[2,3-<i>c</i>]coumarin <i>via</i> a TsOH-mediated tandem reaction
A concise and efficient method for the synthesis of 7-hydroxy-6H-naphtho[2,3-c]coumarin using available 1-(2-hydroxyphenyl)-2-phenylethanone and Meldrum's acid has been developed. This transformation involved a tandem aldol reaction/lactonization/Friedel–Crafts reaction to form a lactone ring and a benzene ring. It showed high atom economy with water and acetone as the byproducts. Mechanism studies
已经开发出使用可用的1-(2-羟基苯基)-2-苯基乙酮和Meldrum酸合成7-羟基-6 H-萘[2,3- c ]香豆素的简洁有效的方法。这种转化涉及串联的羟醛反应/内酯化/弗里德-克来福特反应,形成内酯环和苯环。以水和丙酮为副产物显示出高原子经济性。机理研究证明了Meldrum酸的两个作用:(i)作为串联反应的试剂,以及(ii)作为Friedel-Crafts反应的催化剂。此外,7-羟基-6 H-萘[2,3- c]香豆素进一步通过芳基乙炔基,芳基,和氰基基团,得到d-π-A的化合物具有优良的荧光发射(有效地官能化Φ ˚F = 0.14-0.78)。