The reduction of (η5-C5H5-nMen)2TiCl2 (n = 0, 4, and 5) complexes by magnesium metal in tetrahydrofuran and in the presence of [(trimethylsilyl)ethynyl]ferrocene (2) or [(phenyl)ethynyl]ferrocene (3) affords the (η5-C5H5-nMen)2Ti(η2-FcC⋮CR) complexes [Fc = (η5-C5H5)Fe(η5-C5H4), R = SiMe3 (4−6) and Ph (7−9)]. Crystal structures of 5 and 9 show a titanacyclopropene-like mode of coordination of the acetylenes
的减少(η 5 -C 5 H ^ 5 - ñ我Ñ)2的TiCl 2(Ñ = 0,4,和5)在四氢呋喃和在存在复合物由金属镁[(三甲硅烷基)乙炔基]二茂铁(2)或[(苯基)乙炔基]二茂铁(3),得到(η 5 -C 5 H ^ 5 - ñ我ñ)2的Ti(η 2 -FCC⋮CR)配合物[FC =(η 5 -C 5 H ^ 5)的Fe (η 5 -C 5 H ^4)中,R =森达3(4 - 6)和pH(7 - 9)]。5和9的晶体结构显示了乙炔2和3的钛环类似丙烯的配位模式。乙炔与钛茂单元的键合导致乙炔碳原子的13 C NMR共振显着下移,并呈大红色。 ν(C⋮C)波数的位移。对HC⋮CSiMe 3从头到尾二聚化的配合物6和9的测试表明化合物9诱导二聚作用仅产生2,4-双(三甲基甲硅烷基)but-1-en-3-yne(10),而络合物6是无活性的。
Modular Access to Spiro-dihydroquinolines via Scandium-Catalyzed Dearomative Annulation of Quinolines with Alkynes
three-dimensional molecular architectures from planar aromatics such as quinolines is of great interest and importance from the viewpoint of both organic synthesis and drug discovery, but there still exist many challenges. Here, we report the scandium-catalyzed asymmetric dearomative spiro-annulation of quinolines with alkynes. This protocol offers an efficient and selective route for the synthesis of spiro-dihydroquinoline
Gold‐Catalyzed Reaction of Propargyl Esters and Alkynylsilanes: Synthesis of Vinylallene Derivatives through a Twofold 1,2‐Rearrangement
作者:Olaya Bernardo、Silvia González‐Pelayo、Israel Fernández、Luis A. López
DOI:10.1002/anie.202110783
日期:2021.11.22
An efficient synthesis of structurally complex allenylsilanes through gold-catalyzed coupling of propargyl esters with alkynylsilanes is described. DFT calculations support a stepwise pathway consisting of two 1,2-rearrangements (acyloxy and silyl). A preliminary study on the enantioselective version would demonstrate its feasibility (er up to 95:5).
Ethinylferrocene durch direkte einführung von acetylenen
作者:Michael Buchmeiser、Herwig Schottenberger
DOI:10.1016/0022-328x(92)85050-7
日期:1992.9
Protected ethynylferrocenes were prepared by one-pot-reaction sequences, starting from 1,1′-dilithioferrocene·tmeda via intermediate cupration and subsequent coupling with iodoethynes. The dimethylsulphide complex of copper(I) iodide proved to be the most convenient in situ cupration coupling reagent for this inverse Stephens-Castro reaction type. The corresponding monosubstituted ethynylferrocenes
Alkynylation of ferrocene by terminal alkynes. Part I. A simple one-step synthesis of ferrocenylacetylenes
作者:Victor P. Dyadchenko、Marina A. Dyadchenko、Vladimir N. Okulov、Dmitri A. Lemenovskii
DOI:10.1016/j.jorganchem.2010.09.039
日期:2011.1
Ferrocene reacts with terminal alkynes in the presence of copper and iron salts to give 1-ferrocenyl-2-R-alkynes (R – substituent). This direct cross-coupling of ferrocenyl and alkynyl moieties allows for the preparation of ferrocenyl substituted alkynes in one step directly from ferrocene and a terminal alkyne avoiding prior preparation of other derivatives of ferrocene. This new synthetic reaction