A formal [4 + 2] heterocycloaddition of non-heteroatom-stabilized alkynyl carbenecomplexes and iminopyrroles is described. The reaction implies a totally regioselective synthesis of 6-azaindole derivatives through the formation of the pyridine ring. The mechanism of the reaction has been explored by means of density functional theory calculations, which showed a preference for the [4 + 2] cycloaddition
Pd-Catalyzed Cross-Coupling of Terminal Alkynes with Chromium(0) Fischer Carbene Complexes
作者:Kang Wang、Fengjin Wu、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.7b01096
日期:2017.6.2
Alkyl chromium(0) carbenecomplexes typically undergo cycloadditions with alkynes to afford carbo- or heterocyclic compounds. In the presence of Pd catalyst, it is demonstrated that a traditional cycloaddition pathway is completely altered: instead of cycloaddition, oxidative cross-coupling reaction of alkyl chromium(0) carbenecomplexes with terminal alkynes occurs. The coupling reaction exhibits
Experimental evaluation of the electron donor ability of a gold phosphine fragment in a gold carbene complex
作者:Rachel E. M. Brooner、Ross A. Widenhoefer
DOI:10.1039/c3cc48869a
日期:——
Bond length deformations within the cyclopropyl ring of a gold cyclopropyl(methoxy)carbene complex provide an experimental measure of the electron donor ability of the gold phosphine fragment.
一个金环丙基(甲氧基)卡宾配合物中的环丙基环中键长的变形提供了金膦基片段电子给体能力的实验测量。
Thermal and photochemical reactions of Fischer carbene complexes with trialkylsilyl-substituted alkynes
作者:Zhi Li、William H. Moser、Wenqin Zhang、Changhua Hua、Liangdong Sun
DOI:10.1016/j.jorganchem.2007.11.007
日期:2008.1
Thermal reaction of Fischercarbenecomplexes with triisopropylsilyl (TIPS) substituted alkynes in benzene afforded TIPS-substituted vinylketenes or 2-TIPS-substituted cyclobutenones as major products while photochemical reaction of Fischercarbenecomplexes with trimethylsilyl (TMS) substituted alkynes in acetonitrile afforded 3-TMS-substituted cyclobutenones.