Stereogenic Centers and Axes: A Comparison of the Chiral Topologies Available to Cabcd and abC=C=Ccd

2005 ◽  
Vol 82 (7) ◽  
pp. 1031 ◽  
Author(s):  
Paul Lloyd-Williams ◽  
Ernest Giralt
Keyword(s):  
Stereogenic Centers

Diverse Cyclopentenes via Enantioselective Cu-Catalyzed Desymmetrization

2018 ◽  
Author(s):  
Reece Jacques ◽  
Robert D. C. Pullin ◽  
Stephen P. Fletcher
Keyword(s):  
Ring Systems ◽  
Quaternary Centers ◽  
Stereogenic Centers

<div> <div> <div> <p>A highly regio-, diastereo- and enantioselective Cu-catalyzed desymmetrization of diverse meso-bisphosphates with alkyl zirconium nucleophiles has been developed. The reaction allows access to a broad range of functionalized cyclopentenes with up to three contiguous stereogenic centers, including quaternary centers and spirocyclic ring systems.</p></div></div></div>

Diverse Cyclopentenes via Enantioselective Cu-Catalyzed Desymmetrization

2018 ◽  
Author(s):  
Reece Jacques ◽  
Robert D. C. Pullin ◽  
Stephen P. Fletcher
Keyword(s):  
Ring Systems ◽  
Quaternary Centers ◽  
Stereogenic Centers

<div> <div> <div> <p>A highly regio-, diastereo- and enantioselective Cu-catalyzed desymmetrization of diverse meso-bisphosphates with alkyl zirconium nucleophiles has been developed. The reaction allows access to a broad range of functionalized cyclopentenes with up to three contiguous stereogenic centers, including quaternary centers and spirocyclic ring systems.</p></div></div></div>

Assembly of Fluorinated Chromanones via Enantioselective Tandem Reaction

2021 ◽  
Author(s):  
Mengxue Lu ◽  
Zongli Xiong ◽  
Yuqiao Zhou ◽  
Xin Wang ◽  
Xiaoyi Li ◽  
...  
Keyword(s):  
Enantioselective Synthesis ◽  
Tandem Reaction ◽  
Unsaturated Aldehydes ◽  
Stereogenic Centers ◽  
First Time

The enantioselective synthesis of fluorinated tricyclic chromanones with multiple vicinal stereogenic centers has been realized for the first time, through the tandem reaction between 2-fluorinated 1-(2-hydroxyaryl)-1,3-diketones and α,β-unsaturated aldehydes. In...

scholarly journals Developing a Methodology for Catalytic Asymmetric Crotylation of Aldehydes

Synlett ◽  
2021 ◽  
Author(s):  
Andrei V. Malkov ◽  
Aleksandr E. Rubtsov
Keyword(s):  
Kinetic Resolution ◽  
Lewis Base ◽  
Chiral Auxiliaries ◽  
Organometallic Reagents ◽  
Total Syntheses ◽  
Base Catalysts ◽  
Homoallylic Alcohols ◽  
Stereogenic Centers ◽  
Long Time ◽  
Lewis Base Catalysts

AbstractAsymmetric crotylation has firmly earned a place among the set of valuable synthetic tools for stereoselective construction of carbon skeletons. For a long time the field was heavily dominated by reagents bearing stoichiometric chiral auxiliaries, but now catalytic methods are gradually taking center stage, and the area continues to develop rapidly. This account focuses primarily on preformed organometallic reagents based on silicon and, to some extent, boron. It narrates our endeavors to design new and efficient chiral Lewis base catalysts for the asymmetric addition of crotyl(trichloro)silanes to aldehydes. It also covers the development of a novel protocol for kinetic resolution of racemic secondary allylboronates to give enantio- and diastereomerically enriched linear homoallylic alcohols. As a separate topic, cross-crotylation of aldehydes by using enantiopure branched homoallylic alcohols as a source of crotyl groups is discussed. Finally, the synthetic credentials of the developed methodology are illustrated by total syntheses of marine natural products, in which crotylation plays a key role in setting up stereogenic centers.1 Introduction2 Pyridine N-Oxides as Lewis Base Catalysts3 Bipyridine N,N′-Dioxides as Lewis Base Catalysts4 Chiral Allylating Reagents5 Synthetic Applications6 Concluding Remarks

All-Carbon Quaternary Stereogenic Centers in Acyclic Systems through the Creation of Several C–C Bonds per Chemical Step

2014 ◽  
Vol 136 (7) ◽  
pp. 2682-2694 ◽  
Author(s):  
Ilan Marek ◽  
Yury Minko ◽  
Morgane Pasco ◽  
Tom Mejuch ◽  
Noga Gilboa ◽  
...  
Keyword(s):  
Stereogenic Centers ◽  
The Creation ◽  
Quaternary Stereogenic Centers

Chirality Transfer from a Chiral Primary Alcohol Equivalent Through Allyl Cyanate-to-Isocyanate Rearrangement: Synthesis of (+)-Geranyllinaloisocyanide

Synthesis ◽  
2019 ◽  
Vol 51 (15) ◽  
pp. 2959-2964 ◽  
Author(s):  
Yoshiyasu Ichikawa ◽  
Hirofumi Morimoto ◽  
Toshiya Masuda
Keyword(s):  
Natural Product ◽  
Primary Alcohol ◽  
Marine Natural Product ◽  
Chirality Transfer ◽  
New Approach ◽  
Stereogenic Centers ◽  
Quaternary Stereogenic Centers

A new approach was developed to construct quaternary stereogenic centers bearing nitrogen substituents in an enantioselective manner. The strategy takes advantage of [1,3]-chirality transfer from a chiral primary alcohol equivalent through an allyl cyanate-to-isocyanate rearrangement. This approach was employed in an efficient eight-step synthesis of the marine natural product, (+)-geranyllinaloisocyanide, in 43% overall yield.

Sign in / Sign up

Export Citation Format

Share Document