Pd‐Catalyzed Atropselective C−H Olefination Promoted by a Transient Directing Group
作者:Rohit Kumar、Devesh Chandra、Upendra Sharma
DOI:10.1002/adsc.202101242
日期:2022.2.15
A Pd(II)-catalyzed atropselective olefination of biaryls with maleimides is reported using chiral transient directing group (CTDG) strategy L-tert-leucine is used as a chiral auxiliary to obtain atropselective biaryl aldehydes with enantiomeric excess ranging from 70 to 99%. The method is also applicable for other olefins such as acrylonitrile, phenyl vinyl sulfone, and N-tert-butyl acrylamide, providing
Synthesis of Chiral Aldehyde Catalysts by Pd‐Catalyzed Atroposelective C−H Naphthylation
作者:Gang Liao、Hao‐Ming Chen、Yu‐Nong Xia、Bing Li、Qi‐Jun Yao、Bing‐Feng Shi
DOI:10.1002/anie.201906700
日期:2019.8.12
Chiral aldehyde catalysis opens new avenues for the activation of simple amines. However, the lack of easy access to structurally diverse chiral aldehyde catalysts has hampered the development of this cutting‐edge field. Herein, we report a Pd‐catalyzed atroposelective C−H naphthylation with 7‐oxabenzonorbornadienes for the preparation of axially chiral biaryls with excellent enantioselectivities (up
Microwave-Assisted Suzuki Cross-Coupling Reaction, a Key Step in the Synthesis of Polycyclic Aromatic Hydrocarbons and Their Metabolites
作者:Arun K. Sharma、Krishnegowda Gowdahalli、Jacek Krzeminski、Shantu Amin
DOI:10.1021/jo701665j
日期:2007.11.1
A highly efficient and general method for Suzuki cross-couplingreaction en route to the synthesis of polycyclic aromatic hydrocarbons (PAHs) and their metabolites has been developed. Microwave irradiation of aryl bromides 1 and boronic acids (2 and 3) using polyurea microencapsulated palladium catalyst (Pd EnCat 30) gave the coupling adducts 4 and 5 in excellent yields in just 20 min compared to ∼24
Scalable, Stereocontrolled Formal Syntheses of (+)-Isoschizandrin and (+)-Steganone: Development and Applications of Palladium(II)-Catalyzed Atroposelective C−H Alkynylation
作者:Gang Liao、Qi-Jun Yao、Zhuo-Zhuo Zhang、Yong-Jie Wu、Dan-Ying Huang、Bing-Feng Shi
DOI:10.1002/anie.201713106
日期:2018.3.26
unique structure based on an axially chiral biaryl moiety as well as their significant biological activity. Herein, we describe the development of a palladium‐catalyzed atroposelectiveC−Halkynylation and its application in gram‐scale, stereocontrolledformalsyntheses of (+)‐isoschizandrin and (+)‐steganone. tert‐Leucine was identified as an efficient, catalytic transient chiral auxiliary. A wide
Pd‐Catalyzed Atroposelective C−H Allylation through β‐O Elimination: Diverse Synthesis of Axially Chiral Biaryls
作者:Gang Liao、Bing Li、Hao‐Ming Chen、Qi‐Jun Yao、Yu‐Nong Xia、Jun Luo、Bing‐Feng Shi
DOI:10.1002/anie.201811256
日期:2018.12.21
Biaryl atropisomers are of great importance in natural products, pharmaceuticals, and asymmteric synthesis. The efficient synthesis of these chiral scaffolds with full enantiocontrol and high diversity remains challenging. Reported herein is a Pd‐catalyzed atroposelective C−H allylation with tert‐leucine as an efficient catalytic chiral transient auxiliary. A wide range of enantioenriched biaryl aldehydes