Synthesis, Structure, and Reactivity of Gold(I) α-Oxo Carbenoid Complexes
作者:Caroline P. Stow、Ross A. Widenhoefer
DOI:10.1021/acs.organomet.0c00033
日期:2020.4.27
reaction of complexes 1 with 4-picoline or dimethyl sulfide or via reaction of (IPr)Au(OTf) with stabilized ylides. Complexes 1–6 were thermally stable and were characterized in solution and, in the cases of complexes 2 and 3, by single-crystal X-ray diffraction. Complex 1b underwent carbene transfer to cyclohexene in modest yield at 75 °C. The pyridinium and sulfonium α-oxo carbenoid complexes 2 and 3
Cycloaddition reactions of cycloimmonium ylides with triphenylcyclopropene
作者:Kiyoshi Matsumoto、Takane Uchida
DOI:10.1039/p19810000073
日期:——
course of the reaction is discussed qualitatively. The pyrazinium dicyanomethylide (16) with TPP produces the 7-azaindolizine (19), whereas pyridazinium (17) and phthalazinium (18) dicyanomethylides give the primary adducts (20) and (21), respectively. Reaction of pyridinium bis(alkoxycarbonyl)methylides (22) with TPP gives, however, generally poor or no yield of the indolizines.
underwent 1,3-dipolar cycloaddition with pyridinium bis(methoxy-carbonyl)methylides to afford the corresponding indolizines (8-methoxycarbonyl-7-azatricyclo[7.6.0.02-7]pentadeca-1,3,5,8-tetraenes) in good to moderate yields. Some molecular orbital considerations are also described on this reaction compared with the results on the reaction of pyridiniumdicyanomethylides with cyclooctyne.