Iridium-catalyzed stereoselective [3+2] annulation of α-oxocarboxylic acids with 1,3-dienes
作者:Ryota Yabe、Yusuke Ebe、Takahiro Nishimura
DOI:10.1039/d1cc02003j
日期:——
The stereoselective annulation of α-oxocarboxylic acids with 1,3-dienes proceeded in the presence of a hydroxoiridiumcatalyst to give α-hydroxy-γ-lactones in good yields with high 3,5-trans relative stereochemistry. The use of a chiraldiene ligand for a cationic iridium complex enabled asymmetricannulation with high enantioselectivity.
Stereospecific Nickel-Catalyzed Reductive Cross-Coupling of Alkyl Tosylate and Allyl Alcohol Electrophiles
作者:Quentin D. Tercenio、Erik J. Alexanian
DOI:10.1021/acs.orglett.1c02616
日期:2021.9.17
The stereospecific cross-coupling of easily accessed electrophiles holds significant promise in the construction of C–C bonds. Herein, we report a nickel-catalyzed reductive coupling of allyl alcohols with chiral, nonracemic alkyl tosylates. This cross-coupling delivers valuable allylation products with high levels of stereospecificity across a range of substrates. The catalytic system consists of
Traversing Steric Limitations by Cooperative Lewis Base/Palladium Catalysis: An Enantioselective Synthesis of α‐Branched Esters Using 2‐Substituted Allyl Electrophiles
作者:Kevin J. Schwarz、Colin M. Pearson、Gabriel A. Cintron‐Rosado、Peng Liu、Thomas N. Snaddon
DOI:10.1002/anie.201803277
日期:2018.6.25
Cooperative catalysis enables the direct enantioselective α‐allylation of linear prochiral esters with 2‐substituted allyl electrophiles. Critical to the successful development of the method was the recognition that metal‐centered reactivity and the source of enantiocontrol are independent. This feature is unique to simultaneous catalysis events and permits logical tuning of the supporting ligands
Catalytic Chemo-, Regio-, and Enantioselective Bromochlorination of Allylic Alcohols
作者:Dennis X. Hu、Frederick J. Seidl、Cyril Bucher、Noah Z. Burns
DOI:10.1021/jacs.5b01384
日期:2015.3.25
Herein we describe a highly chemo-, regio-, and enantioselective bromochlorination reaction of allylic alcohols, employing readily available halogen sources and a simple Schiff base as the chiral catalyst. The application of this interhalogenation reaction to a variety of substrates, the rapid enantioselectivesynthesis of a bromochlorinated natural product, and preliminary extension of this chemistry to
In Turn or in Reverse Palladium-Catalyzed Carbonyl Allylation and Diels-Alder Reaction by 2-Methylene-3-buten-1-ol
作者:Yoshiro Masuyama、Manabu Fuse、Yasuhiko Kurusu
DOI:10.1246/cl.1993.1199
日期:1993.7
UsingPdCl2(PhCN)2-SnCl2, 2-methylene-3-buten-2-ol causes carbonylallylation of various aldehydes to afford 1-substituted-3-methylene-4-penten-1-ols; the Diels-Alder reaction of those with dienophiles produces 1-(2-hydroxyethyl)cyclohexenes. Diels-Alder reaction of 2-methylene-3-buten-1-ol with dienophiles followed by carbonylallylation produces structurally isomeric 1-methylene-2-(hydroxymethyl)cyclohexanes