Single and Consecutive Cyclization Reactions of Alkynyl Carbene Complexes and 8-Azaheptafulvenes: Direct Access to Polycyclic Pyrrole and Indole Derivatives
作者:José Barluenga、Jaime García-Rodríguez、Ángel L. Suárez-Sobrino、Miguel Tomás
DOI:10.1002/chem.200901257
日期:2009.9.7
The reactivity of alkynyl and enynyl Fischer carbene complexes towards 8‐azaheptafulvenes is examined. Alkynyl carbenes 1 a–f undergo regioselective [8+2] heterocyclization with 8‐aryl‐8‐azaheptafulvenes 2 a, b providing cycloheptapyrroles 3 and 4 with metal carbene or ester functionality at C3. Moreover, consecutive cyclizationreactions are involved when enynyl carbenes are used. Thus, the cyclopenta[b]pyrrole
Unusual [1,2]- and [1,3]-M(CO)<sub>5</sub> Shifts in Fischer Carbene Complexes: [4 + 3] and [3 + 3] Annulation Reactions of Furan and Pyrrole Rings
作者:José Barluenga、Miguel Tomás、Eduardo Rubio、José A. López-Pelegrín、Santiago García-Granda、Mónica Pérez Priede
DOI:10.1021/ja983692o
日期:1999.4.1
The cycloadditionreactions of various C-heteroarylimines with α,β-unsaturated Fischercarbenecomplexes have been studied. Either [3 + 3] carbocyclization or [3 + 3] and [4 + 3] heterocyclization reactions were accomplished, depending on the structure of the imine and on the type of unsaturation of the carbenecomplex. Imines derived from furan-, 4, benzofuran-, 5, and N-methylindole-2-carboxaldehyde
New Class of Fischer-Type Carbene Complexes Containing an <i>o</i>-Carboranyl Substituent. Synthesis and Crystal Structure of (CO)<sub>5</sub>W[C(OMe)(PhC<sub>2</sub>B<sub>10</sub>H<sub>10</sub>)] and (CO)<sub>4</sub>(PhC<sub>2</sub>B<sub>10</sub>H<sub>10</sub>)Mn[C(OCH<sub>3</sub>)(CH<sub>3</sub>)]
作者:Young-Joo Lee、Se-Jin Kim、Chang-Hwan Kang、Jaejung Ko、Sang Ook Kang、Patrick J. Carroll
DOI:10.1021/om9707127
日期:1998.3.1
RC2B10H10Li (3a,b R = CH3, C6H5) with metal carbonyl complexes M(CO)6 (M = Cr, W) followed by quenching the reaction with the electrophilic reagent [Me3O]+[BF4]- afforded the [(o-carboranyl)methoxycarbene]metal complexes (CO)5M[C(OMe)(RC2B10H10)] (1a−d) in yields ranging from 37 to 43%. Complexes 1a−d were also formed on reaction of alkynylcarbene complexes (CO)5M[C(OCH3)(C⋮CR)] (4a−d: M = Cr, W; R = CH3, C6H5)
用羰基金属配合物M(CO)6(M = Cr,W)处理硫代邻碳氢化合物RC 2 B 10 H 10 Li(3a,b R = CH 3,C 6 H 5),然后用碳酸氢钠淬灭反应。亲电试剂[Me 3 O] + [BF 4 ] -得到[(o-碳硼烷基)甲氧基卡宾]金属络合物(CO)5 M [C(OMe)(RC 2 B 10 H 10)](1a - d),收益率范围从37%到43%。炔基卡宾配合物(CO)5 M [C(OCH 3)(C⋮CR)](4a - d:M = Cr,W; R = CH 3,C 6 H 5)的反应也形成配合物1a - d与苯中的B 10 H 12 L 2(5 ; L = CH 3 CN)分离得到的产率为47-63%。配合物1d的X射线结构表明,钨原子的八面体配位为(o-甲碳烷基)甲氧基卡宾和五个羰基。同样,已经研究了带有邻-碳甲酰基配体的锰的卡宾配合物的合成。配合物(CO)5 Mn(RC
Competitive Pathways in the Reaction of Lithium Oxy‐
<i>ortho</i>
‐quinodimethanes and Fischer Alkoxy Alkynyl Carbene Complexes: Synthesis of Highly Functionalised Seven‐Membered Benzocarbocycles
作者:Patricia García‐García、Carlos Novillo、Manuel A. Fernández‐Rodríguez、Enrique Aguilar
DOI:10.1002/chem.201002092
日期:2011.1.10
alkyl or aryl group is placed at position 1 of the oQDM in its reaction with tungsten carbenecomplexes; however, a pyranylidene carbenecomplex is formed when a chromium carbenecomplex is used. Alternatively, the presence of bulky alkoxy groups in the FCC component favours a Diels–Alder aromatisation sequence, which leads to 1‐naphthyl FCCs. Furthermore, the isolation and the characterisation of several
Photochemically Driven Addition of Iminyl Radicals to Alkynyl Fischer Carbene Complexes
作者:Marina Blanco-Lomas、Alegría Caballero、Pedro J. Campos、Héctor F. González、Susana López-Sola、Laura Rivado-Casas、Miguel A. Rodríguez、Diego Sampedro
DOI:10.1021/om200438y
日期:2011.7.11
Nitrogen-centered radicals, generated by the action of UV light, are capable of reacting with alkynyl Fischercarbenecomplexes in two ways, 1,2- and 1,4-addition. Our results constitute the first reported example of a photochemically driven reaction of this kind.