zinc bromides and regioconvergent Negishi coupling with aryl or alkenyl triflates. The use of a suitable phosphine ligand favoring Pd migration enabled the selective formation of the linear cross‐coupling product. Subsequently, mixtures of secondary alkyl bromides were prepared from linear alkanes by standard bromination, and regioconvergent cross‐coupling then provided access to the corresponding linear
AZEPANE DERIVATIVES AND METHODS OF TREATING HEPATITIS B INFECTIONS
申请人:Novira Therapeutics, Inc.
公开号:US20150197493A1
公开(公告)日:2015-07-16
Provided herein are compounds useful for the treatment of HBV infection in a subject in need thereof, pharmaceutical compositions thereof, and methods of inhibiting, suppressing, or preventing HBV infection in the subject.
Palladium-Catalyzed Negishi Cross-Coupling Reactions of Unactivated Alkyl Iodides, Bromides, Chlorides, and Tosylates
作者:Jianrong Zhou、Gregory C. Fu
DOI:10.1021/ja0363258
日期:2003.10.1
A single method (2% Pd(2)(dba)(3)/8% PCyp(3)/NMI in THF/NMP at 80 degrees C; Cyp = cyclopentyl) achieves the cross-coupling of a range of beta-hydrogen-containing primary alkyliodides, bromides, chlorides, and tosylates with an array of alkyl-, alkenyl-, and arylzinc halides. The process is compatible with a variety of functional groups, including esters, amides, imides, nitriles, and heterocycles
Reductive cross-coupling of aryl halides with ubiquitous alkyl tosylates was developed using a combination of nickel and vitamin B12 catalysts. The tosylate was activated by reduced vitamin B12 to form alkyl cobalt(III) which served as a good alkylating agent for aryl-nickel species, leading to the C(sp3)–C(sp2) bond formation.
Nickel-Catalyzed Negishi-Type Arylation of Trialkylsulfonium Salts
作者:Hideki Yorimitsu、Hiroko Minami、Keisuke Nogi
DOI:10.1055/s-0040-1707817
日期:2021.9
Negishi-type arylation of trialkylsulfonium salts with arylzinc reagents has been accomplished under nickel catalysis. The use of cyclohexanethiol as an additional ligand was found to be particularly important to promote C–S cleavage. The present reaction accommodates one-pot arylation of dialkylsulfides by combining with S-methylation with MeOTf. Mechanistic experiments suggest that C–S cleavage