Directed Catalytic Asymmetric Olefin Metathesis. Selectivity Control by Enoate and Ynoate Groups in Ru-Catalyzed Asymmetric Ring-Opening/Cross-Metathesis
作者:Russell E. Giudici、Amir H. Hoveyda
DOI:10.1021/ja070187v
日期:2007.4.1
concept in catalyticasymmetric olefin metathesis is introduced: a nonreacting enoate or ynoate group can be used to alter and significantly enhance the enantioselectivity. Catalyticasymmetricring-opening/cross-metathesis (AROM/CM) processes proceed in ≤30% ee with non-styrenyl cross partners. However, with olefin partners bearing an enoate or ynoate group (1,6-diene or 1,6-enyne), catalytic AROM/CM
引入了催化不对称烯烃复分解的新概念:非反应性烯酸酯或炔酸酯基团可用于改变和显着提高对映选择性。催化不对称开环/交叉复分解 (AROM/CM) 过程在≤30% ee 的情况下与非苯乙烯基交叉伙伴进行。然而,由于烯烃伙伴带有烯酸酯或炔酸酯基团(1,6-二烯或 1,6-烯炔),催化 AROM/CM 可提供高达 98% ee 的所需产物,与与苯乙烯反应的对映选择性相反或脂肪族交叉伙伴。这种新方法首次将有效金属催化的 AROM/CM 的范围扩展到非苯乙烯基烯烃和环丙烯的反应,这是一组多样化且易于获得的底物,
Boyarskaya, I. A.; Baidin, V. N.; Domnin, I. N., Journal of Organic Chemistry USSR (English Translation), 1990, vol. 26, # 11, p. 1990 - 1997
作者:Boyarskaya, I. A.、Baidin, V. N.、Domnin, I. N.
DOI:——
日期:——
Bicyclobutanes from 1,1-dibromo-2,2-dialkylcyclopropanes
作者:Duncan W. Brown、Michael E. Hendrick、Maitland Jones
DOI:10.1016/s0040-4039(01)87081-7
日期:1973.1
Asymmetric Copper-Catalyzed Carbozincation of Cyclopropenes en Route to the Formation of Diastereo- and Enantiomerically Enriched Polysubstituted Cyclopropanes
作者:Daniel S. Müller、Ilan Marek
DOI:10.1021/jacs.5b11220
日期:2015.12.16
The enantioselective synthesis of cyclopropylzinc reagents has been achieved via a copper-catalyzed carbozincation of 3,3-disubstituted cyclopropenes with diorganozincreagents. The obtained organozinc compounds can be easily functionalized with a broad range of electrophiles, including palladium-catalyzed cross-couplings, affording highly substituted cyclopropanes. The operationally simple procedure
Gold(<scp>i</scp>)-catalysed synthesis of conjugated trienes
作者:Maximillian S. Hadfield、Ai-Lan Lee
DOI:10.1039/c0cc04217j
日期:——
Gold(I)-catalysed reaction between cyclopropenes and furans produces functionalised conjugated trienes. The reaction is mild, facile and proceeds with very low catalyst loadings.