Chemistry of Dienyl Anions. I. Crystalline Dienyl Anions by Direct Reaction of Conjugated and Non-conjugated Dienes with Alkali Metals in the Presence of Et<sub>3</sub>N
Series of acyclic and cyclic dienyl anions were prepared from both conjugated and non-conjugated dienes by direct metalation with alkalimetals (Li, Na, K, Rb, and Cs) in tetrahydrofuran in the pre...
Synthesis of Homoallylic Alcohols with Acyclic Quaternary Centers through Co
<sup>III</sup>
‐Catalyzed Three‐Component C−H Bond Addition to Internally Substituted Dienes and Carbonyls
作者:Sun Dongbang、Zican Shen、Jonathan A. Ellman
DOI:10.1002/anie.201906633
日期:2019.9.2
substituted dienes and a wide range of aldehydes and activated ketones. Isoprene and other internally monosubstituted dienes are effective inputs, with the reaction proceeding with high diastereoselectivity for those substrate combinations that result in more than one stereogenic center. Moreover, the opposite relative stereochemistry can be achieved by employing 1,2-disubstituteddienes. A mechanism
Cu(I)-Catalyzed Diamination of Conjugated Dienes. Complementary Regioselectivity from Two Distinct Mechanistic Pathways Involving Cu(II) and Cu(III) Species
作者:Baoguo Zhao、Xingao Peng、Yingguang Zhu、Thomas A. Ramirez、Richard G. Cornwall、Yian Shi
DOI:10.1021/ja207691a
日期:2011.12.28
four-membered Cu(III) species A and Cu(II) radical species B, which are in rapid equilibrium. The internal diamination likely proceeds in a concerted manner via Cu(III) species A, and the terminal diamination likely involves Cu(II) radical species B. Kinetic studies have shown that the diamination is first-order in N,N-di-t-butyldiaziridinone (1), zero-order in olefin, and first-order in total Cu(I) catalyst
Cu(I)-Catalyzed Regioselective Diamination of Conjugated Dienes via Dual Mechanistic Pathways
作者:Baoguo Zhao、Xingao Peng、Sunliang Cui、Yian Shi
DOI:10.1021/ja103838d
日期:2010.8.18
This paper describes the Cu(I)-catalyzed regioselectivediamination of conjugated dienes using di-tert-butyldiaziridinone as nitrogen source. The internal diamination and terminal diamination likely proceed via two mechanistic pathways. Various dienes can be efficiently diaminated at the internal double bonds with high regio- and diasteroselectivity in good yield using inexpensive CuBr as catalyst