Catalytic Asymmetric Allylic Substitution with Copper(I) Homoenolates Generated from Cyclopropanols
作者:Qi Zhang、Si‐Wei Zhou、Chang‐Yun Shi、Liang Yin
DOI:10.1002/anie.202110709
日期:2021.12.6
A catalytic asymmetricallylicsubstitution with NHC-stabilized copper(I) homoenolates generated from cyclopropanols is developed that affords γ-chiral ketones in excellent regio- and high enantioselectivities. This process enables the generation of chiral quaternary carbon centers and features a broad substrate scope.
A Versatile New Catalyst for the Enantioselective Isomerization of Allylic Alcohols to Aldehydes: Scope and Mechanistic Studies
作者:Ken Tanaka、Gregory C. Fu
DOI:10.1021/jo010792v
日期:2001.11.1
[Rh(cod)(2)]BF(4), serves as an effective catalyst for asymmetric isomerizations of allylic alcohols to aldehydes, furnishing improved yields, scope, and enantioselectivities relative to previously reported methods. The catalyst is air-stable and can be recovered at the end of the reaction. Mechanistic studies establish that the isomerization proceeds via an intramolecular 1,3-hydrogen migration and that
Hydride reduction of alpha, beta-unsaturated carbonyl compounds using chiral organic catalysts
申请人:MacMillan David
公开号:US20060161024A1
公开(公告)日:2006-07-20
Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction is enantioselective, and proceeds with a variety of hydride donors, catalysts, and substrates. The invention also provides compositions effective in carrying out the 1,4-hydride addition of α,β-unsaturated carbonyl compounds.
Asymmetric Hydrogenation of Allylic Alcohols Using Ir–N,P-Complexes
作者:Jia-Qi Li、Jianguo Liu、Suppachai Krajangsri、Napasawan Chumnanvej、Thishana Singh、Pher G. Andersson
DOI:10.1021/acscatal.6b02456
日期:2016.12.2
γ-disubstituted and β,γ-disubstituted allylicalcohols were prepared and successfully hydrogenated using suitable N,P-based Ir complexes. High yields and excellent enantioselectivities were obtained for most of the substrates studied. This investigation also revealed the effect of the acidity of the N,P–Ir-complexes on the acid-sensitive allylicalcohols. DFT ΔpKa calculations were used to explain the effect of
Synthesis and antimalarial activity of 6-cycloalkylvinyl substituted 1,2,4-trioxanes
作者:Chandan Singh、Naveen Chandra Srivastav、Sunil K. Puri
DOI:10.1016/j.bmc.2004.08.042
日期:2004.11
6-Cycloalkylvinyl substituted 1,2,4-trioxanes 6-15 have been prepared and tested against multi-drug resistant Plasmodium yoelii in mice. The most active trioxane 11 provides 80% protection to the treated mice. Further derivatization of 11 leads to decrease in antimalarial activity.