Rhenium-Catalyzed 1,3-Isomerization of Allylic Alcohols: Scope and Chirality Transfer
作者:Christie Morrill、Gregory L. Beutner、Robert H. Grubbs
DOI:10.1021/jo061436l
日期:2006.9.1
The scope of the triphenylsilyl perrhennate (O3ReOSiPh3, 1) catalyzed 1,3-isomerization of allylicalcohols has been thoroughly explored. It was found to be effective for a wide variety of secondary and tertiary allylicalcohol substrates bearing aryl, alkyl, and cyano substituents. Two general reaction types were found which gave high levels of product selectivity: those driven by formation of an
Unconventional isomerization of allylic alcohols to allylcarbinols mediated by lanthanide catalysts
作者:SungYong Seo、Xianghua Yu、Tobin J. Marks
DOI:10.1016/j.tetlet.2013.01.111
日期:2013.4
We report here the catalytic isomerization of aryl-substituted allylic alcohols mediated by lanthanide alkoxide complexes. The conversion yields allylcarbinols as the products of the olefin isomerization process, but with different olefinic positions than those afforded by typical transition metal catalysts. The average isolated product yields in these reactions are 65–81%. The catalytic cycle and
Function-oriented investigations of a peptide-based catalyst that mediates enantioselective allylic alcohol epoxidation.
作者:Nadia C. Abascal、Phillip A. Lichtor、Michael W. Giuliano、Scott J. Miller
DOI:10.1039/c4sc01440e
日期:——
an investigation of a peptide-based catalyst (6) that is effective for the site- (>100:1:1) and enantioselective epoxidation (86% ee) of farnesol. Studies of the substrate scope exhibited by the catalyst are included, along with an exploration of optimized reaction conditions. Mechanistic studies are reported, including relative rate determinations for the catalyst and propionic acid, a historical perspective
Synthesis of α-Quaternary Formimides and Aldehydes through Umpolung Asymmetric Copper Catalysis with Isocyanides
作者:Kentaro Hojoh、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1021/jacs.6b12881
日期:2017.2.15
A highly regio- and enantioselective copper-catalyzed three-component coupling of isocyanides, hydrosilanes, and γ,γ-disubstituted allylic phosphates/chlorides to afford chiral α-quaternary formimides was enabled by the combined use of our original chiral naphthol-carbene ligand as a functional Cu-supporting ligand and LiOtBu as a stoichiometric Lewis base for Si. The formimides were readily converted
通过结合使用我们原始的手性萘酚-卡宾配体,实现了高度区域选择性和对映选择性铜催化的异氰化物、氢硅烷和 γ,γ-二取代的烯丙基磷酸酯/氯化物的三组分偶联,以提供手性 α-季铵甲酰亚胺。功能性 Cu 支持配体和 LiOtBu 作为 Si 的化学计量路易斯碱。甲酰亚胺很容易转化为α-季醛。
Asymmetric Radical Bicyclization of Allyl Azidoformates via Cobalt(II)-Based Metalloradical Catalysis
作者:Huiling Jiang、Kai Lang、Hongjian Lu、Lukasz Wojtas、X. Peter Zhang
DOI:10.1021/jacs.7b05778
日期:2017.7.12
azidoformates to construct aziridine/oxazolidinone-fused bicyclic structures. The Co(II) complex of D2-symmetric chiral amidoporphyrin 3,5-DitBu-QingPhyrin has been identified as an effective metalloradical catalyst for the intramolecular radical aziridination of this type of carbonyl azides, allowing for high-yielding formation of synthetically useful chiral [3.1.0]-bicyclic aziridines with high diastereo-
基于钴(II)的金属催化已成功地用于烯丙基叠氮基甲酸酯的自由基双环化,以构建氮丙啶/恶唑烷酮融合的双环结构。D 2对称的手性氨基卟啉3,5-Di t Bu-QingPhyrin的Co(II)配合物已被鉴定为这种羰基叠氮化物分子内自由基叠氮化的有效金属铁催化剂,可合成高产具有高非对映体和对映体选择性的有用的手性[3.1.0]-双环氮丙啶。