92074-34-5Relevant academic research and scientific papers
Catalytic Cyclooligomerization of Enones with Three Methylene Equivalents
Farley, Conner M.,Zhou, You-Yun,Banka, Nishit,Uyeda, Christopher
supporting information, p. 12710 - 12714 (2018/10/09)
Cyclic structures are highly represented in organic molecules, motivating a wealth of catalytic methods targeting their synthesis. Among the various ring-forming processes, cyclooligomerization reactions possess several attractive features but require addressing a unique challenge associated with controlling ring-size selectivity. Here we describe the catalytic reductive cocyclooligomerization of an enone and three carbene equivalents to generate a cyclopentane, a process that constitutes a formal [2 + 1 + 1 + 1]-cycloaddition. The reaction is promoted by a (quinox)Ni catalyst and uses CH2Cl2/Zn as the C1 component. Mechanistic studies are consistent with a metallacycle-based pathway, featuring sequential migratory insertions of multiple carbene equivalents to yield cycloalkanes larger than cyclopropanes.
REGIOSELECTIVE STANNYLMETALATION OF ACETYLENES IN THE PRESENCE OF TRANSITION-METAL CATALYST
Hibino, Jun-ichi,Matsubara, Seijiro,Morizawa, Yoshitomi,Oshima, Koichiro,Nozaki, Hitosi
, p. 2151 - 2154 (2007/10/02)
The reaction of terminal acetylenes with Bu3SnMgMe, Bu3SnAlEt2, or (Bu3Sn)2Zn in the presence of various transition-metal catalysts provides vinylstannanes in good yields.Whereas copper catalyzed stannylmagnesation of 4-benzyloxy-1-butyne gives (E)-4-benz
