Reactions of Vinylidenecyclopropanes with Diphenyl Diselenide in the Presence of AIBN and Thermally-Induced Further Transformations
作者:Wei Yuan、Yin Wei、Min Shi、Yuxue Li
DOI:10.1002/chem.201103461
日期:2012.1.27
vinylidenecyclopropanes with diphenyl diselenide in the presence of AIBN and upon heating gives the corresponding bicyclo[3.1.0]hexane derivatives in good yields. These compounds undergo thermal‐induced radical 1,4‐hydrogen shifts through a ring‐opening pathway of allylic cyclopropane to give the corresponding cyclohexene derivatives stereoselectively in good yields at 200 °C (see scheme).
An Efficient Method for the Synthesis of Alkylidenecyclobutanones by Gold-Catalyzed Oxidative Ring Enlargement of Vinylidenecyclopropanes
作者:Wei Yuan、Xiang Dong、Yin Wei、Min Shi
DOI:10.1002/chem.201201161
日期:2012.8.20
Rings of gold: Vinylidenecyclopropanes can undergo efficientoxidativeringenlargements under mild conditions to give the corresponding alkylidenecyclobutanone derivatives in good yields (see scheme). A plausible mechanism for this transformation has been proposed, and a new AuI–N complex, which can be used as an efficient catalyst in this oxidation reaction, has been isolated.
金戒指:亚乙烯基环丙烷在温和的条件下可以进行有效的氧化环扩环,从而以高收率得到相应的亚烷基环丁酮衍生物(参见方案)。已经提出了这种转化的合理机制,并且已经分离出可以用作该氧化反应的有效催化剂的新的Au I – N络合物。
Dual Photoredox and Nickel Catalysis in Regioselective Diacylation: Exploring the Versatility of Nickel Oxidation States in Allene Activation
作者:Shrikant D. Tambe、Ho Seong Hwang、Eunhui Park、Eun Jin Cho
DOI:10.1021/acs.orglett.4c01373
日期:2024.5.17
regioselective radical diacylation of allenes with ketoacids to produce 1,4-dione products by dual photoredox and nickel catalysis. This integrated approach merges redox-active oxidative addition and reductive elimination steps with migratory insertion. The acyl radical generated in the photoredoxcycle sequentially adds to Ni(I) and Ni(II) intermediates following a Ni(I)–Ni(II)–Ni(II)–Ni(III)–Ni(I) catalytic
Visible-light-promoted hydrocarboxylation of allenes with formate salt and CO2 was developed for the first time using commercially available [Ir(ppy)2(dtbbpy)]PF6 as a photocatalyst. This strategy provides an efficient and practical method to access β,γ-unsaturated linear carboxylic acids in moderate yields with complete regioselectivity.