Palladium(II) catalyzed cyclization of alkynoic acids
作者:Claude Lambert、Kiitiro Utimoto、Hitosi Nozaki
DOI:10.1016/s0040-4039(01)81594-x
日期:——
Under the catalytic action of palladium(II) in the presence of triethylamine, 3-, 4-, and 5-alkynoic acids afford 3-buten-4-olides, 4-penten-4-olides, and 5-hexen-5-olide, respectively, in good to excellent yields.
A highly active diradical cobalt(<scp>iii</scp>) catalyst for the cycloisomerization of alkynoic acids
作者:Nicolas Leconte、Amaury du Moulinet d'Hardemare、Christian Philouze、Fabrice Thomas
DOI:10.1039/c8cc04459g
日期:——
The first cobalt-catalysed cycloisomerisation of alkynoicacids is reported, thanks to the design of a well-defined diradical cobalt(III) catalyst, in the absence of any additives. The high efficiency, regioselectivity and chemoselectivity are comparable to those of noble metal-based systems. The unique reactivity might be attributed to second coordination sphere effects.
Metalloenzyme-Mimicking Supramolecular Catalyst for Highly Active and Selective Intramolecular Alkyne Carboxylation
作者:Li-Chen Lee、Yan Zhao
DOI:10.1021/ja501277j
日期:2014.4.16
loading (30-100 times lower than typical levels used in literature examples), constant high reaction rate throughout the course of the reaction, lack of the hydrolyzed side product, and substrate selectivity unobserved in conventional gold catalysts.
Anticancer platinum complexes as non-innocent compounds for catalysis in aqueous media
作者:José Alemán、Virginia del Solar、Carmen Navarro-Ranninger
DOI:10.1039/b917758b
日期:——
An efficient cyclization of alkyne-acids to enol-lactones catalyzed by anticancer platinum(II) and platinum(IV) compounds is described. These compounds are not only DNA-binding complexes; they can also catalyze reactions in solvents such as acetone, methanol, water or blood plasma.
The phosphinoboration of 2-diphenylphosphino benzaldehyde and related aldimines
作者:Meagan B. Kindervater、Justin F. Binder、Samuel R. Baird、Christopher M. Vogels、Stephen J. Geier、Charles L.B. Macdonald、Stephen A. Westcott
DOI:10.1016/j.jorganchem.2018.11.001
日期:2019.2
reactions proceed selectively to give one new product where the phosphide fragment has added to the aldehyde (or imine) carbon atom and the electron-deficient boron group has added to the electron-rich heteroatom. Preliminary studies show these new compounds can ligate to Pd(II) and Pt(II) metal centres. These novel metal complexes, as well as the organic soluble [MCl2(coe)]2 (M = Pd, Pt, coe = cis-cyclooctene)
我们研究了向2-二苯基膦基苯甲醛(2-Ph 2 PC 6 H 4 C(O)H)添加简单的膦基硼酸酯Ph 2 PBpin(pin = 1,2-O 2 C 2 Me 4)以及相关方法醛亚胺衍生物(2-Ph 2 PC 6 H 4C(NR)H)作为产生带有路易斯酸Bpin侧基的独特二膦配体的简单有效策略。这些反应选择性地进行,得到一种新产物,其中磷化物片段已添加到醛(或亚胺)碳原子上,而缺电子的硼基团已添加到了富电子杂原子上。初步研究表明,这些新化合物可以连接到Pd(II)和Pt(II)金属中心。这些新型金属络合物以及有机可溶[MCl 2(coe)] 2(M = Pd,Pt,coe = 顺式-环辛烯)化合物已被证明是有效的预催化剂,可用于炔酸环化反应对应的exo-挖环内酯。采用这些金属络合物的反应还产生了不同寻常的内挖式环内酯,这些环内酯传统上在这些环化反应中没有观察到。例如,4-戊酸的反应还提供