Di S-2-butylenmethylcarbinol;3,4,5-trimethyl-2,5-pentadien-4-ol;3,4,5-trimethyl-hepta-2,5-dien-4-ol;3,4,5-Trimethylhepta-2,5-dien-4-ol;3,4,5-trimethylhepta-2,5-dien-4-ol
Source of Rate Acceleration for Carbocation Cyclization in Biomimetic Supramolecular Cages
作者:Quynh Nhu N. Nguyen、Kay T. Xia、Yue Zhang、Nanhao Chen、Mariko Morimoto、Xiaokun Pei、Yang Ha、Jinghua Guo、Wanli Yang、Lee-Ping Wang、Robert G. Bergman、Kenneth N. Raymond、F. Dean Toste、Dean J. Tantillo
DOI:10.1021/jacs.2c04179
日期:2022.6.29
quantum chemical and molecular dynamics calculations reveal that polyanionic gallium-based cages accelerate cyclization reactions of pentadienyl alcohols as a result of substrate cage interactions, preferential binding of reactive conformations of substrate/H3O+ pairs, and increased substrate basicity. However, the increase in basicity dominates. Experimental structure–activity relationship studies
量子化学和分子动力学计算结果表明,聚阴离子镓基笼由于底物笼相互作用、底物/H 3 O +对的反应构象的优先结合以及底物碱度增加而加速了戊二烯醇的环化反应。然而,碱度的增加占主导地位。金属顶点和笼的总电荷变化的实验结构-活性关系研究证实了通过计算得出的模型。
1,2,3,4,5-PENTAMETHYLCYCLOPENTADIENE
作者:Threlkel, Richard S.、Bercaw, John E.、Seidler, Paul F.、Stryker, Jeffrey M.、Bergman, Robert G.
DOI:10.15227/orgsyn.065.0042
日期:——
A convenient synthesis of Alkyltetramethylcyclopentadienes and Phenyltetramethylcyclopentadiene
作者:Richard S. Threlkel、John E. Bercaw
DOI:10.1016/s0022-328x(00)87959-0
日期:1977.8
Enzymelike Catalysis of the Nazarov Cyclization by Supramolecular Encapsulation
作者:Courtney J. Hastings、Michael D. Pluth、Robert G. Bergman、Kenneth N. Raymond
DOI:10.1021/ja102633e
日期:2010.5.26
The water-soluble, self-assembled, tetrahedral assembly K12Ga4L6 (L = 1,5-biscatecholamidenaphthalene) catalyzes the Nazarov cyclization of 1,3-pentadienols with extremely high levels of efficiency. The catalyzed reaction proceeds over a million times faster than the background reaction, an increase comparable to those observed in some enzymatic systems. This catalysis operates under aqueous conditions at mild temperatures and pH, and the reaction is halted by the addition of an appropriate inhibitor. This unprecedented rate enhancement is attributed to both the stabilization of protonated reaction intermediates and the effect of constrictive binding on the bound guest.
Enzyme-like Control of Carbocation Deprotonation Regioselectivity in Supramolecular Catalysis of the Nazarov Cyclization
作者:Courtney J. Hastings、Mikael P. Backlund、Robert G. Bergman、Kenneth N. Raymond
DOI:10.1002/anie.201105325
日期:2011.11.4
The kinetically controlled, regioselectivedeprotonation of cyclopentenyl cations is mediated by encapsulation within a metal–ligand assembly. The regiochemistry of the deprotonation step determines which one of two possible products is formed. Moreover, subtle differences in the stereochemistry of the encapsulated cation switch the selectivity of this process (see scheme).