Reaction of aminocarbene complexes of chromium with alkynes. 2. Intramolecular insertions leading to polycyclic lactams
作者:Evelyne Chelain、Andree Parlier、Max Audouin、Henri Rudler、Jean Claude Daran、Jacqueline Vaissermann
DOI:10.1021/ja00076a015
日期:1993.11
Thermolysis of chromium-containing carbene complexes of the general structure (CO) 5 Cr=C(NR 2 R 3 )-(CH 2 ) n C=C-R 1 has been examined. When nitrogen is part of a strained cycle (R 2 R 3 =(CH 2 ) m , m=2, 3) or in an allylic position, or if m>4, then the insertions of the triple bond and of CO, followed by a rearrangement to tricyclic lactams, are observed. This was the case for 14 (R 2 R 3 =(CH
已经检查了一般结构 (CO) 5 Cr=C(NR 2 R 3 )-(CH 2 ) n C=CR 1 的含铬卡宾配合物的热解。当氮是应变循环的一部分 (R 2 R 3 =(CH 2 ) m , m=2, 3) 或处于烯丙基位置时,或者如果 m>4,则三键和 CO 的插入,随后通过重排为三环内酰胺,观察到。14 (R 2 R 3 =(CH 2 ) 3 ,n=4,R 1 =Ph),18 (R 2 R 3 =(CH 2 ) 3 ,n=3,R 1 =Ph) 就是这种情况),对于 27 (R 2 R 3 =CH 2 CH=CHCH 2 ,n=4,R 1 =Ph),分别导致 15、19 和 28,其结构可以通过 X 射线确定晶体学
Carbene-complex-promoted ring expansion of aziridine: formation of the 1-azabicyclo[4.3.0] ring system by a double alkyne and a single carbon monoxide insertion reaction
作者:Bernard Denise、Andrei Parlier、Henri Rudler、Jacqueline Vaissermann、J. C. Daran
DOI:10.1039/c39880001303
日期:——
A chromium carbene complex (2) bearing a 2-methylaziridine ring system on the carbene carbon atom easily undergoes a double diphenylacetylene and a single CO insertionreaction to give a 1-oxotetrahydroindolizine derivative (4), which has been fully characterized by X-ray analysis of its Cr(CO)3 adduct (3).
Pd-Catalyzed Inter- and Intramolecular Carbene Transfer from Group 6 Metal−Carbene Complexes<sup>1</sup>
作者:Miguel A. Sierra、Juan C. del Amo、María J. Mancheño、Mar Gómez-Gallego
DOI:10.1021/ja002497i
日期:2001.2.1
intramolecular carbene transfer reactions has been studied. Thus, pentacarbonyl[(aryl)(methoxy)carbene]chromium(0) and tungsten complexes, 10, efficiently dimerize at room temperature in the presence of diverse Pd(0) and Pd(II)/Et(3)N catalysts. The effect of additives (PPh(3), AsPh(3), or SbPh(3)) on the nature and the isomeric ratio of the reaction products is negligible. The nature of the reaction products
Dihydropyridines in Organometallic Synthesis. Formation of Pyridine and Dihydropyridine-Stabilized Alkylidene Complexes of Tungsten(0) and Chromium(0) from Fischer Carbene Complexes: Structure and Reactivity
1,2- and 1,4-dihydropyridines react with alkoxycarbene complexes of chromium and tungsten to give, upon an unprecedented hydride transfer, alcohol elimination, and pyridine fixation on the carbene carbon, a new class of air-stable pyridinium ylide complexes. These pyridine-protected alkylidene complexes of chromium(0) and tungsten(0) were fully characterized by X-ray crystallography. In the case of
The Photochemical Reaction of Vinylaziridines and Vinylazetidines with Chromium(0) and Molybdenum(0) (Fischer) Carbene Complexes
作者:Alexandra R. Rivero、Israel Fernández、Miguel A. Sierra
DOI:10.1002/chem.201302029
日期:2014.1.27
The [5+2] and [6+2] cycloaddition reactions of vinylaziridines and vinylazetidines with ketenes generated photochemically from chromium(0) and molybdenum(0) Fischercarbenecomplexes have been investigated. These processes constitute a straightforward and efficient route to azepanones and azocinones, respectively. The peculiar electronic properties of the metalated ketenes allow for the introduction