Selective reduction of alkynes to cis-alkenes by hydrometallation using [(Ph3P)CuH]6.
作者:John F. Daeuble、Colleen McGettigan、Jeffrey M. Stryker
DOI:10.1016/s0040-4039(00)97371-4
日期:1990.1
Selective reduction of alkynes to the corresponding alkenes is reported using the stable, readily prepared copper(I) hydride reagent, [(Ph3P)CuH]6. Terminal alkynes are reduced at room temperature, unactivated internal alkynes react only at elevated temperature. Disubstituted alkynes with propargyl activation are also reduced, giving cis-olefins selectively. Protection of propargylic alcohol functionality
Room-Temperature Direct Alkynylation of Arenes with Copper Acetylides
作者:Cédric Theunissen、Gwilherm Evano
DOI:10.1021/ol502030y
日期:2014.9.5
C–H bond in azoles and polyhalogenated arenes can be smoothly activated by copper acetylides to give the corresponding alkynylated (hetero)arenes by simple reaction at room temperature in the presence of phenanthroline and lithium tert-butoxide under an oxygen atmosphere. These stable, unreactive, and readily available polymers act as especially efficient and practical reagents for the introduction
Two practical and complementary methods are reported for the synthesis of trifluoromethylated alkynes. The first one, a mix‐and‐stir process, is based on the oxidative trifluoromethylation of readily available and bench‐stable copper acetylides while the second one, which displays a broad substrate scope and has several advantages over existing procedures, is based on the oxidativecopper‐catalyzed
Copper-Catalyzed Synthesis of 2,4-Disubstituted Allenoates from α-Diazoesters
作者:Matthew Hassink、Xiaozhong Liu、Joseph M. Fox
DOI:10.1021/ol2006242
日期:2011.5.6
α-substituted-α-diazoesters with terminal alkynes to give substituted allenoates is described. Key to the development of a selective method was the recognition that an adventitous base catalyzes the isomerization to form the allenoate product. A plausible mechanism is proposed, based in part on evidence against a mechanism that involves a Cu(I)-acetylide as a low-valent intermediate.
描述了一种用于将 α-取代-α-重氮酯与末端炔烃偶联以产生取代的烯丙酸酯的 Cu 催化方法。开发选择性方法的关键是认识到外来碱催化异构化形成烯丙酸酯产物。提出了一种合理的机制,部分基于反对将 Cu(I)-乙炔化物作为低价中间体的机制的证据。
New σ-alkynylides of Cu(I) and Ag(I)
作者:E.C. Royer、M.C. Barral、V. Moreno、A. Santos
DOI:10.1016/0022-1902(81)80207-2
日期:1981.1
Polymeric compounds of the type (MCCR)x (MCu, Ag; R = cyclohexyl, n-hexyl) and M2(p-(CC)C6H4)] x (MCu, Ag) have been prepared. The preparation media and solvent (liquid ammonia, methanol and methanol/ or methanol-ether/aqueous ammonia) exert an influence over the nature of the alkynyl compound, leading either to the formation of adducts or to the formation of metal alkynylides with identical empirical
(MCCR)x(MCu,Ag; R =环己基,n-己基)和M 2(p-(CC)C 6 H 4)] x(MCu,Ag )已经准备好了。制备介质和溶剂(液态氨,甲醇和甲醇/或甲醇-醚/氨水)会对炔基化合物的性质产生影响,导致形成加合物或形成具有相同经验式的金属炔属化合物,但颜色不同,这似乎与分子缔合的不同程度有关。