Organocatalytic Enantioselective Synthesis of α-Fluoro-β-amino Acid Derivatives
作者:Matthew R. Straub、Vladimir B. Birman
DOI:10.1021/acs.orglett.8b03297
日期:2018.12.7
catalyst HBTM-2 generates 3-fluoro-β-lactams with high enantio- and diastereoselectivity. These reactive compounds are opened with alcohols or amines to produce the corresponding α-fluoro-β-amino acid derivatives in moderate yields.
The first nickel(0)-catalyzed [2 + 2 + 1] carbonylative cycloaddition reaction of imines and alkynes or norbornene has been achieved by employing phenyl formate as a CO source. With this method, a variety of N-benzenesulfonyl, -tosyl, and -phosphoryl-substituted γ-lactams can be prepared in good to high yields.
Aza-Morita–Baylis–Hillman reactions catalyzed by a cyclopropenylidene
作者:Xun Lu、Uwe Schneider
DOI:10.1039/c6cc06201f
日期:——
Catalysis using a bis(dialkylamino)cyclopropenylidene (BAC) has been developed, which relies on a formal umpolung activation of Michael acceptor pro-nucleophiles.
A method for the synthesis of amide‐containing molecules was developed using vinylazides as an enamine‐type nucleophile towards carbon electrophiles, such as imines, aldehydes, and carbocations that were generated from alcohols in the presence of BF3⋅OEt2. After nucleophilic attack of the vinylazide, a substituent of the resulting iminodiazonium ion intermediate migrates to form a nitrilium ion,
Electronic and Steric Tuning of an Atropisomeric Disulfoxide Ligand Motif and Its Use in the Rh(I)-Catalyzed Addition Reactions of Boronic Acids to a Wide Range of Acceptors
作者:Guang-Zhen Zhao、Daven Foster、Gellért Sipos、Pengchao Gao、Brian W. Skelton、Alexandre N. Sobolev、Reto Dorta
DOI:10.1021/acs.joc.8b01269
日期:2018.9.7
efficiently to the rhodium precursor. The performance of this disulfoxide ligand [(M,S,S)-p-Tol-6F-BIPHESO] in catalysis was tested in both 1,4- and 1,2-addition reactions of arylboronic acids. We show that addition to both cyclic and acyclic enones as well as N-tosylarylimines proceeds with high yields and high enantioselectivities to give the corresponding products. The synthesis of enantiomerically pure p-Tol-6F-BIPHESO