A Palladium-Catalyzed Cyclization−Oxidation Sequence: Synthesis of Bicyclo[3.1.0]hexanes and Evidence for S<sub>N</sub>2 C−O Bond Formation
作者:Xiaofeng Tong、Matthias Beller、Man Kin Tse
DOI:10.1021/ja070919j
日期:2007.4.1
A novel palladium-catalyzed cyclization−oxidation sequence yielding bicyclo[3.1.0]hexanes was developed. A mechanism involving a Pd(II)/Pd(IV) cycle was proposed. An SN2 C−O bond formation from an alkyl−palladium(IV) intermediate was also suggested.
开发了一种新的钯催化环化氧化序列,产生双环 [3.1.0] 己烷。提出了涉及 Pd(II)/Pd(IV) 循环的机制。还建议从烷基-钯(IV)中间体形成 SN2 CO 键。
Synthesis of Bicyclo[3.1.0]hexan-2-ones
by Manganese(III) Oxidation in Ethanol
作者:Hiroshi Nishino、Kentaro Asahi
DOI:10.1055/s-0028-1083324
日期:——
underwent the manganese(III)-induced oxidative intramolecular cyclization in ethanol to produce 3-azabicyclo[3.1.0]hexan-2-ones in good yields. A similar reaction of propenyl 3-oxobutanoates and S-propenyl 3-oxobutanethioates also gave the corresponding 3-oxa- and 3-thiabicyclo[3.1.0]hexan-2-ones. The reaction details, the structure determination, and the reaction pathway are described. cyclizations - oxidations
Stereoselective Gold(I) Domino Catalysis of Allylic Isomerization and Olefin Cyclopropanation: Mechanistic Studies
作者:Sebastian Klimczyk、Xueliang Huang、Hanspeter Kählig、Luís F. Veiros、Nuno Maulide
DOI:10.1021/acs.joc.5b00666
日期:2015.6.5
Gold(I) catalysis of olefin activation is still a rare feature in the repertoire of that metal. Mechanistic studies on the gold(I)-catalyzedcyclopropanation of allyl-substituted sulfonium ylides, including kinetic analysis as well as detailed computational studies, reveal that the reaction proceeds through activation of the alkene moiety. Furthermore, a novel competitive allylic isomerization pathway
Stereoselective intramolecular cyclopropanation through catalytic olefin activation
作者:Xueliang Huang、Sebastian Klimczyk、Luís F. Veiros、Nuno Maulide
DOI:10.1039/c2sc21914j
日期:——
A novel stereoselective and convergent catalytic method for the cyclopropanation of electron-neutral and -rich olefins by sulfonium ylides is reported which unusually proceeds through olefin activation rather than by metal carbene formation.